>>4083274Trial and error and repetition. You'll most likely start off with your line art looking like chicken scratch, it's a thing people do when they're not confident enough and instead of drawing one smooth line they draw multiple connected short lines. I got over that subconsciously just by just repetitive doodling. You'll eventually realize how easy it is to erase a mistake, specifically if you're drawing on the computer with a drawing tablet. Once you get over your fear of making mistakes, your line art will naturally get cleaner.
For my practice, I would try to recreate very simple characters as accurately as I could. Rimuru Tempest's slime form for example is basically an oval for his face/body two big lines for his eyes, and like two to four small lines for his eye creases. If you can master that, you've basically just drawn your first anime character. Meatwad from Aqua Teen Hunger Force is another character I love drawing, very simple but instantly recognizable design. Drawing something simple like Meatwad and having it come out almost tv show accurate is what gave me a huge confidence boost. Start simple and then challenge yourself to recreate slightly more complex characters.
Eventually I would try to do some proper drawings, using techniques like sketching and using guide lines. Sketching is what kills a lot of people who want to learn how to draw, they want to skip it and just draw a finished product. Anyway, I applied every thing I've learned and eventually I could draw black and white line art headshots of characters like Nagataro, Jahy and Nadeshiko from Yuru Camp. Even though it's just line art, it's cute so I'm happy.
The tl;dr of all this is that you have to draw Meatwad, I can not stress this part enough. Good luck, anon.