Starting Sage

[Gemina]

Even with having played SCH since HW, there was still a bit of a learning curve. While I could recognize which skills mirrored SCH's and place them in a similar crossbar setup, I could not do that with all of them. They have plenty of skills that are unique to them such as Toxicon, Kardia/Soteria, Phelgma, Pneuma, Icarus, Eukrasia, Haima/Panhaima. None of these skills are things SCH can do. In order to get a hold of the job, I had to recognize that SGE is still a healer, and it is really helpful to set up your healing abilities in a similar manner as a healer you are already used to playing.

For example, you do have SCH leveled so I would place Druochole in the same place you have Lustrate; Kerachole in the same place you have Sacred Soil; Ixochole in the same place you have Indom; Physis in the same place you have Whispering Dawn, etc.

Eukrasia and Addersting are mechanics unique to SGE, and they coincide with each other. Something you can try is soloing boss FATEs of a level at or even above your own, and allow your chocobo to grab enmity. You can then get into the habit of using Eukrasia to deploy shields that will break, especially if you use them when the boss is telegraphing an attack. You can also deploy the shields on yourself if you have hate. But I mention your bird specifically as a substitution for a tank.

A lot of normal 8-man content make deploying shields redundant. Against single target, Toxicon is essentially a return for spending a GCD to deploy a shield. Against multiple enemies though like when tanks pull W2W, it's return is magnificent and you definitely should be deploying those shields. Toxicon is also a movement skill, so you could look at shield deployment as storing adderstings for situations when the boss will force movement.

Try not to stress about too much though. Proceed at a pace you're comfortable with. The more you play any job in FFXIV, the better you get at it. Practice, practice, practice.

[Jeeqbit]

Haima/Panhaima

Panhaima is basically Seraph.

[Gemina]

Panhaima is basically Seraph.

No, it's not. Panhaima works in reverse to Consolation. With Consolation, players get the direct healing up front before any damage is received. With Panhaima, the direct healing comes from whatever stacks remain after the damage has taken place. Because of this, even though both abilities are used to mitigate damage, when they are used is different. In order for a SCH to get the full potency from Consolation, they need to wait until the group receives the initial AoE attack. For SGE, they need to execute Panhaima before any damage is received.

This isn't going to make a whole lot of difference in casual content, but in situations where incoming damage has a significant threat level, maximizing the available potency these abilities give helps alleviate some of the pressure from it.

[Maltothoris]

Kardia/Soteria, P

Soteria is rouse and Kardia was actually an old thing that some schs did where they marcoed where whenever they casted broil, the fairy would heal party based on their position in the party list.

[Jeeqbit]

Soteria is rouse and Kardia was actually an old thing that some schs did where they marcoed where whenever they casted broil, the fairy would heal party based on their position in the party list.

Well now from my perspective, these heal potency buffs like Soteria or Zoe are replacing things like the single target regen Scholar has, or Recitation. This is a list I made a while ago.

Kardia/Summon Eos
Eukrasia and Pepsis/Emergency Tactics
Dosis/Broil
Eukrasian Dosis/Bio
Diagnosis/Physic
Eukrasian Diagnosis/Adloquium
Prognosis/Emergency Tactics+Succor
Eukrasian Prognosis/Succor
Ergeiro/Resurrection
Physis/Whispering Dawn+Fey Illumination
Phlegma/Energy Drain
Druochole/Lustrate
Dyskrasia/Art of War
Kerachole/Sacred Soil
Ixochole/Indomitable
Taurochole/Excogitation
Haima/Summon Seraph
Panhaima/Consolation
Rhizomata/Aetherflow
Krasis/Protraction
Pneuma/Dissipation
Holos/Fey Blessing
Zoe/Recitation
Soteria/Aetherpact

[Gemina]

Soteria is rouse and Kardia was actually an old thing that some schs did where they marcoed where whenever they casted broil, the fairy would heal party based on their position in the party list.

Rouse and macroing Embrace are in the past. Kardia is still SGEs answer to Embrace from SCH's fairy but Eos will cast Embrace regardless of what the SCH is doing, even during downtime when the boss is not targetable. SCH's can still increase the potency of Embrace by using Fey Illumination or Protraction, but each of those skills also has mitigation attached to them as well, which is received by the target/party members regardless if the SCH is dealing damage or not. These are apple and orange comparisons at best.

[AnotherPerson]

Even with having played SCH since HW, there was still a bit of a learning curve. While I could recognize which skills mirrored SCH's and place them in a similar crossbar setup, I could not do that with all of them. They have plenty of skills that are unique to them such as Toxicon, Kardia/Soteria, Phelgma, Pneuma, Icarus, Eukrasia, Haima/Panhaima. None of these skills are things SCH can do. In order to get a hold of the job, I had to recognize that SGE is still a healer, and it is really helpful to set up your healing abilities in a similar manner as a healer you are already used to playing.

For example, you do have SCH leveled so I would place Druochole in the same place you have Lustrate; Kerachole in the same place you have Sacred Soil; Ixochole in the same place you have Indom; Physis in the same place you have Whispering Dawn, etc.

There are certain skills SCH and SGE doesn't share, such as aetherflow and Icarus. I just swap unique skills there based on how frequent or ease-of-access the placement of the keybind is relative to my other skills.
Depending on how far your DPS keybinds and early game heal keybinds are, you can just swap them based on missing hotbar space. I keep my GCD skills all relatively close to each other and capstone skills all in the same location, basically keybinds are located on how often I need them and press them. So even though the loadout isn't 100% identical, the core playstyle can be more or less the same, resulting in a very similar keybind mapping. The differences and nuances of skills only affect the order and timing you press the keybinds.

SCH Physick/Adloquium -> SGE Eukrasia (Replace one of the two as SGE uses Eukrasia + Diagnosis to get SCH Adloquium and Eukrasia + Dosis to get SCH Bio).
SCH Ruin II -> SGE Toxikon (Same key function. You use this as minimally as possible because Broil / Dosis has a weave slot and it's a DPS loss to use outside of strict movement. Generally, SGE only needs 3 at optimal settings and rarely touch this skill otherwise.)
SCH Summon Selene/Eos -> SGE Kardia (Slight different activation, but mostly same functional use case - you basically only use it once on the tank/starting duty and very rarely need to press it again in most scenarios for general usage other than tank swapping).
SCH Bio -> SGE Phlegma (SGE don't have a separate DoT, so you can place Phlegma here to keep your DPS keybinds roughly the same).
SCH Summon Seraph/Consolation -> SGE Panhaima (Equivalent effective healing potency, slightly different optimal use cases as SGE works better on multi-hit and SCH on bigger hits but functionally the same capstone. Works functionally the same in dungeons.)
SCH Aetherpact -> SGE Haima/Soteria (Equivalent capstone, but SGE frontloads all Haima shields before turning into healing while Aetherpact is a slower stream of healing that can be interrupted -- so you just use Aetherpact earlier than Haima for mobs and Haima earlier than Aetherpact for boss mechanics. Alternatively, you can put Soteria here for a better simplicity to treating your Kardia as buffed Fairy Healing, but Soteria is honestly really weak. At most, you'll treat it as a mini Aetherpact.)
SCH Deployment Tactics -> SGE has nothing for this, so free hotbar slot to move some keybinds around. I moved Haima here so I can shield people easier.
SCH Emergency Tactics -> SGE Pepsis (Reverse shield break to heal vs turn shield into heal, same general use case - the order is just swapped)
SCH Protraction -> SGE Krasis (Same usage for single target modification effect)
SCH Lustrate -> SGE Durochole (Same effect, 1 to 1 mapping)
SCH Indomitability -> SGE Ixochole (Same effect, 1 to 1 mapping)
SCH Sacred Soil -> SGE Kerachole (Same effect with slightly different placement, but 1 to 1 mapping in resource)
SCH Excogitation -> SGE Taurochole (Only difference in aetherflow vs addersgall resource, but still does healing at same lv unlock, so you can map it 1 to 1)
SCH Recitation -> SGE Rizomata (Grants/Enables additional resource effect at same level unlock, can be mapped 1 to 1 on hotbar)
SCH Whispering Dawn -> SGE Physis (AoE Regen at same lv unlock)
SCH Fey Blessing -> SGE Holos (AoE heal at same lv unlock for keybind mapping, but SGE has a much stronger effect as it provides a bigger shield/mitigation)
SCH Aetherflow -> SGE has no equivalent. Put whatever unique skill or move around some keybinds to better suit your playstyle.
SCH Expedient -> SGE has no equivalent. The mitigation went into Holos. Put whatever unique skill or move around some keybinds to better suit your playstyle. I put Pneuma here because they're both capstones with long cd.
SCH Fey Illumination -> SGE has no equivalent because the healing buff went into Physis II. Put whatever unique skill or move around some keybinds to better suit your playstyle. I put Zoe because Zoe can be used to flexibly buff shields or Pneuma heals.
SCH Pet Place -> SGE has no equivalent. Put whatever unique skill or move around some keybinds to better suit your playstyle.
SCH Pet Heel -> SGE has no equivalent. Put whatever unique skill or move around some keybinds to better suit your playstyle.