Where to learn to craft?

I see a lot of comments saying simply playing the game won't give you enough currency to purchase good gear upgrades at higher levels. Prices are just too high a week into the league. The message to those commenting is "you need to craft for profit ... go and learn".

What are recommended resources to properly learn the 0.3 crafting possibilities?

https://www.craftofexile.com

https://poe2db.tw/us/Modifiers

And youtube for the tricks & craft logic.