[protonimitate]

Drawing on the Right Side of the Brain is the holy grail. I don't think you'll find a much better single "diy" resource. I don't think you need to follow it cover to cover, but it's a great reference resource to have and contains a lot of super valuable exercises and resources for drawing "the right way".

Honestly, I wouldn't spend money on instruction unless it's in person - drawing is ultimately about seeing and it's hard to instruct that online. Other tutorials/lessons tend to be about copying existing work rather than drawing from life, which is the foundation of all drawing/art skills.

Learn about the basic elements of art (line, shape, color, value, form, texture, and space) and the principles of design (balance, contrast, emphasis, movement, pattern, rhythm, unity) and look up exercises to practice them all.

Most people only care about "line" when drawing (forced perspective, outlining the subjects, etc). This is a trap. Think about "drawing through the object" (don't outline and then fill in later, etc) and utilizing all the other elements of art.

Draw still life setups/landscapes/people from real life. A lot. Do long drawing sessions (4+ hours with the same subject). Short time boxed ones (15 mins max, 30 mins max, etc). Draw the same setup every day for a week. Draw every day.

If you want to copy other works, start with copying drawings/sketches from the "masters".

If possible, find a group drawing class to get IRL feedback.

Once you do this for a year or two you should have a pretty good foundation for pretty much any drawing/painting discipline.

Ultimately it's about repeated practice. Make it a daily habit and you'll see big improvements.

Source: art school, drawing/painting for 15 years.

[falcolas]

Seconded. In still a terrible artist/sketcher, but thats due more to a lack of practice at this point.

[schrectacular]

Came to say this too. Had so much fun going through that book. Definitely check it out.