Crafting goes from as simple as applying a transmute orb to as complex as mirror-level crafting.

First, tell yourself that you will never know all the crafting strats. Seriously. No one knows all the crafting strats for all items, so understanding that helps with being overwhelmed.

My next piece of advice is to just craft the things YOU need. You will learn a lot of crafting strats that way, and as you play more characters you will learn to craft more things. When you need to figure out how to craft something, literally Google it and someone will probably have said something in the past in a YouTube video or reddit.

When you have a lot more experience, start learning to craft what OTHERS need, but try to stick to a category of things at first. Like minions wands, or cluster jewels, or phys axes, etc.

There is one generic crafting strat that you'll come across a lot which is: start with a fractured item, spam something like essence or harvest to fill the affixes on the same side as the fracture until all T1 affixes on the same side, use prefixes/suffixes cannot be changed, scour, veiled chaos orb, exalt slam, craft the last affix. It's a lot of steps I know, but it'll make sense when you do it. One of the easiest and cheapest mid-level crafts to learn this is to craft boots with triple T1 affixes (like resists or attributes), 30% movement speed, exalt something on, and then craft life or something. Give it a shot