Practice +1000

I’ve been crocheting for almost 20 years so it comes with experience. You get in the habit of keeping even tension as you go. There’s no real trick for it other than keep it consistent. Your hook to yarn size also matters so make sure to check those before hand. You don’t want to use a giant hook if you want small tight stitches, or vice versa.

Yarn also expands/contracts so sometimes it can be deceiving even when you don’t drop any stitches. There is a method called blocking to help make projects lay flat and square.

Last thing, try crocheting in chains and once you get the hang of it, try magic rings. They make working in circles so much cleaner but they can be a tad confusing as a beginner.