There are tons of resources online especially on youtube.
Imo now is the time to experiment and learn all the different mechanics for future leagues since currency is so easy to farm with the vaal temple printing machine.
In terms of priority i think you should get to know at least the following:
Setting up your bases, item levels and affixes, recombination, different ways on how to cycle desecrations, setting up a ladder craft method by fracturing the lowest ilvl affix then going affix by affix to ensure that you never brick your item on the way to get all T1, etc…
Good luck!