Cross class skills

[Frizze]

Here, i can mark that for you OP.

Trick of the Trade
Byregot's Blessing - Carpenter level 50
Careful Syn II - Weaver level 50
Ingenuity II - Blacksmith level 50
Piece by Piece - Armorer level 50
Comfort Zone - Alchemist level 50
Innovation
Steady Hand II
Hasty Touch
Muscle Memory - Culinarian level 54
Maker's Mark + Flawless Syn - Goldsmith level 54

Unmarked skills are lower levels of the classes listed(specifically, those are alchemist culinarian and goldsmith abilities). And having Waste Not(Leatherworker level 15) can help while leveling up(it basically gets replaced though). Caimie wrote a really nice and detailed guide about all of this, which you can find linked from the post here on this forum.