Aidan Chopra has a nice book. He used to work for SketchUp and he really knows the software and material well, and he also has some valuable videos to go along with it.
Having said that, I’ll also make a case for this forum being among the best learning tools there are.
Why? because:
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You get a variety of opinions, more than what typically make it into a book. And they will be specific to your real world examples/issues.
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You’ll be putting your work up for a light hearted critique, which holds the value of letting others point out possible issues with your model which you may not even be aware of yet… [ a benefit of exposing pitfalls before you discover them on your own, or they become more serious ].
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You’ll get to see what others do with your working model, and how they go about fixing things, and what their thought processes are. Tips that are offered on how to save time, or get better results with less effort… basically being exposed to best practice modeling & efficiency techniques.
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Every idea posted, is itself, up for improvement by anyone else. so there’s a collective review process which keeps things aligned to a best practices, and best tips approach.
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And this one could very easily be moved higher up on the list… The Forum Archives. . . Reading and researching questions that have already been answered and discussed. It’s unlikely anybody has a problem which hasn’t already been addressed here. Folks keep up the questions and answers because it’s fun, and it’s social… but for those who truly want to read… Reading random question on the forum is a great way to pick stuff up.
Don’t forget about the SketchUp Knowledge Center which is available from the Help menu within the software.
…And for that matter SketchUP has been having what they call <a href"SketchUp 3D Basecamp 2016>SketchUp Basecamps, One is about to happen in a couple of months… You could still attend, but even if you didn’t it doesn’t really matter. . . they records the conference sessions and post the videos up online. so you can always watch them after the fact.