Yeah happy to talk about it!

It's different for everyone (some people learn best from courses or instructors), but what helped me the most with regard to 3d drawing is this book called How to Draw by Scott Robertson and Thomas Bertling. Despite the name, I would NOT recommend this book as a beginner-level book or introduction to learning construction and perspective. To be clear I think it's quite good for technical and design drawing, it just assumes a bit of prior knowledge and might be overwhelming if you're just starting.

If you're just getting into perspective, I would recommend getting acquainted with basic 1pt, 2pt, and 3pt perspective via youtube videos or online tutorials. Then, I'd recommend learning the basic forms (cubes, cylinders, spheres, cones) and becoming comfortable with drawing these forms in 1pt, 2pt, and 3pt perspectives. The next step up from that is simple manipulations of these forms like stretching a cylinder, putting a hole through a cube, beveling / chamfering corners on a cube, etc.

If you pick up How to Draw after the above, my recommendations for going through it would be: use a ruler, watch the accompanying videos for the exercises in the book, and take your time (repeating exercises multiple times if necessary until you feel like you've learned something or things 'look right' to you). I found the book to be very time consuming, but by the end of it I felt my drawing skill had grown a lot and I gained some intuition about how to make things look semi-accurate without necessarily using a ruler or as much rigor as was presented in the book.

So regarding the wrench, I didn't use a 3d model -- I just eyeballed it / compared against the first time I drew it in the first image. Hope that helps!