Literally depends on the medium you want to work with:

• Crochet is easy, esp for bulky weight yarns because it builds up quickly and requires less skill to maintain your stitches (and the hooks are fairly inexpensive). It's very popular with teenagers/tiktokers for that reason and there are a lot of people putting free patterns out there. Once you get into thinner weights of yarn and lacework then the difficulty goes up, but lacework really makes a project more interesting to make and the final aesthetic is something cool that you don't normally see in mass produced clothes. If you get good enough to do lace I'd recommend Japanese pattern books.

• Knitting is a little harder than crochet but is very similar in that yarn doesn't ask a whole lot from you except to have the right-sized needles. Knitting equipment can get slightly more expensive if you want to get into making socks, sweaters, or cardigans. Needle size, length, and whether you prefer double-pointed needles (DPNs) or Circular Knitting Needles will have an effect on what equipment you need, but the good news is that they're likely to last a lifetime once you get them. The reason for this is that knit stitches don't hold the yarn on their own and loose ends have to be tied off when you finish a project, so if your needles aren't set up correctly you can have some unevenness, missed stitches, etc. Knitting is good for if you like smooth looking stitches, colorwork, lacework, or cables. There are tons of youtube videos about getting into knitting, advanced stitches, etc. And lots of places like Ravelry have free or affordable patterns.

• Sewing is the big difficult one. Getting a sewing machine that can do standard modern clothing stitches is expensive, and because it's gotten popular as a hobby, people are buying up vintage sewing machines. Like the other two fiber-arts (well, four if you count Nalebinding and Weaving) there are loads of youtube tutorials on how to get started, good first projects, how to DIY a Dress Form, etc. But patterns are harder to come by and most places charge for them, even if it's resold or adapted vintage patterns. The one good part, though, is that if you draw out a paper pattern onto cheap cloth and cut it out, you now have an infinitely re-usable pattern (some people also rip all the stitches out of thrifted clothing to use the panels as patterns). I'd also recommend places like https://freesewing.org/ once you get your feet wet.

So I guess it depends on what you're feeling? I can try to pull up some links based on that.