Rassidic

Well there are gathering skills which involve physically doing stuff in MC to gather and crafting skills that you use to make stuff with the stuff you gathered! For the former you have to actively sit around and mine/fish/chop ect. For the latter you need to just get supplies and have the correct workbench that goes with the skill. Then you test out different items to see what gives the best exp like compost bins to woodworker or a stack of chainmail boots to blacksmith. Then you grind, grind, grind, and that's how you do it!

Halfling, auto-aging enabled, farming. Boom.

Grind Alchemy while it's easy. It has ridiculous XP rates as of now.