I picked up a couple of knitting needles yesterday... Failed miserably. Got the slip-knot and couldn't figure out how to cast on.
I can crochet, sew & do cross stitch... But that knitting thing is still a mystery.
If you know how to a chain stitch for crochet, you can get started with knitting without learning any other caston.
Just make a chain in a needle about as wide as your knitting needle, and then, put the loop on your knitting needle, and pick up a loop from every chain, just like if you were doing afghan crochet. And then start knitting.
You can also use a row of half hitches. And later, when you understand more, you can learn the traditional thumbing cast on, or the knitted on cast on.
I do the thumbing one most, because it was the way people who knitted socks professionally in the 1700s did it. It works great with a rib stitch. But it's not always the best cast on for the job. And guessing how long to have the tail takes experience. And the knitted on cast on can be too tight.
These are things to worry about later.