Best way to earn grand company seals?

My friends just got a house and I can't do anything within it until I am a certain rank. Is there a certain amount of seals you cane get per day, or is there ways to get extra so it doesn't take a super long time to reach the rank needed to do any housing stuff? Sorry for the long winded question. Still a new player, whereas they have had time to do quests before bidding and don't remember aside from the dailies. Thank you!

There are many ways of getting company seals. There is no maximum number of seals you can get in a day, but some methods are limited in how often you can use them.
Methods include:
Doing daily supply and provision missions, if you have crafter and gatherer classes unlocked
Expert delivery missions where you hand in dungeon gear for seals (Requires reaching Sergant Second Class rank)
Doing FATEs in pre-ShB areas
Daily leveling roulette and guildhest roulette (bonuses for being an Adventurer in need)
Grand Company Hunt Log (non-repeatable)
Grand Company levequests

Expert deliveries tend to be the most efficient once you have it unlocked. Supply and provision missions give okay number of seals, and a lot of exp for you crafter/gatherer classes

Everything MistakeNot said is good. I personally think the most efficient way to do it (prior to getting expert deliveries unlocked) is to raise a tank, healer, and DPS to at least level 16 each so you can queue for Leveling roulette repeatedly each day. The big GC seal bonus for Leveling roulette is an adventurer-in-need bonus that is not limited to once per day.

Do the GC hunting log while you’re queuing, and save and start turning in all your green dungeon gear when you unlock expert deliveries, and you should rank up to 2nd Lt. in no time at all.

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Originally Posted by ZitiPenneBean

My friends just got a house and I can't do anything within it until I am a certain rank. Is there a certain amount of seals you cane get per day, or is there ways to get extra so it doesn't take a super long time to reach the rank needed to do any housing stuff? Sorry for the long winded question. Still a new player, whereas they have had time to do quests before bidding and don't remember aside from the dailies. Thank you!

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The official owner of your new FC can allow you to do pretty much anything related to the FC house by granting appropriate privileges. "Lower" ranks in the FC are generally there to ensure players are not disruptive to the FC before being granted privileges. Privileges are generally granted as you rise through the ranks because the level of trust (and your own level of participation in the FC) have increased. This pertains to gardening, decorating (although, for 300K, you can purchase your own FC "room" and decorate it to your hearts content), etc.

You can ask your friends to allow you privileges. Note that this assumes your friends bought a Free Company (FC) house, of course, but your mention of 'ranks' implied that was so.

Wrote a guide about this a couple of months ago.
Hopefully it might help understand the grand companies :)
https://lootandlevel.com/ffxiv-grand-company-guide/