I have 10 years of focused learning experience. I wasted some time and found out the best
way to improve over the years by trial and error.
Some people say "learn the basics" and this is true but I have to warn you about it.
Too much theory can lead to overthinking, burn out and it can be overwhelming very fast.
I did that mistake several times.
To get good at drawing comics there is no faster way than to draw comics. This is very
important. Skip the part where your brain tells you things like "I´m not good enough yet"
or "I first have to improve my skills to tell that story".
Start making comics right away without learning theory. Write a short script, draw a 2 (example)
page comic.
Then do a short theory period. Here is one example. You can learn how to draw better proportions
because in your first comic you realised that you have no clue how to draw a human.
Then get back to drawing the next comic or draw the first comic again with what you learned
about proportions.
At some point you will learn about perspective, how to draw faces and all that stuff, but don´t try
to learn that all at once and don´t try to learn all that before starting your comics. Learn it allong
the way.
Draw the first comic in the most simple and broken down style which works for you. Stick figures
and similar. It doesn´t matter as long as you finish the comic. Finished comic = biggest learning progress
I´m doing some daily warm ups like quick sketches and line excercises but that´s all advanced stuff
that you can learn later