ways to approach 1-, 2-, 3-, ..., 6-point perspective

1) high precision — always use rulers

Use rulers 100% of the time. Sort of approach it like drafting.

Some recommended resources:

• The Complete Guide to Perspective Drawing: From One-Point to Six-Point by Craig Attebery — If you're mathematically- or geometrically-minded, this is the book for you. It's a treasure trove of information. I found its section on various ways to draw circles in perspective (ellipses) to be particularly valuable.
• Creative Perspective for Artists and Illustrators by Ernest W. Watson — A fairly gentle introduction.

2) medium precision — flexible "rulers"

The benefit — elastic bands / rubber bands are much quicker to place. The challenge — you have to learn how to freehand straight lines because you can't push against a solid ruler any more.

Recommended resources:

• @bkartchitect01 on TikTok, explaining how to use elastic strings
  • @bkarchitect01 on YouTube
  • more resources on Patreon (shadows!)
• architectdrw on YouTube
• Lineke Lijn on YouTube
• Channel FMT on YouTube
• Skits Comic on YouTube

3) low precision — completely freehand

Use a ruler very infrequently, and freehand most of it. Approach it like a sketch artist might.

It goes much much faster, and it allows you to draw much more organic shapes.

Even here though, there are some artists who draw in a more precise style [1] [2] [3] and others who use more of a rough-sketch style [1] [2].

(I will never have the skill to do this last one, but it's interesting to see that it's possible.)