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Yep, brilliant.org + the first book from minireference.com are what OP needs.

I found that the community on brilliant.org can be quite toxic. I was a member for awhile, but quit due to the people on the site.

It gives me great pain to hear this.

Please do email me silas [at] brilliant.org, so I can figure out which failure mode you hit and evaluate if it has improved at all since you quit.

In addition, as others have noted, our courses have no community aspect to them at all.

I’m using brilliant, but just the courses, not any of the community parts. What was the failure mode?

I think the final thing was on the daily challenges; I always tried to solve them before looking at the answers even If I don't know the "proper" math to do so. I had posted my (correct) solution that I got to by writing a program to work it out; and I got some replies saying I was an idiot for not doing in the proper (math) way.

Ah, that type. Thanks for the heads-up.

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