The original source of customer development (aka product / market fit).

Building products doesn't mean they're good or useful. Build less to build better.

Accessible, standard book that is surprisingly cheap.

Don't agree with all of these anymore but definitely worth reading.

Oh my god it's so short just read it again and again.

The 'Startup School' ones are particularly good.

If you want to creep on product people talking about products.

Lots of different content, but some great threads about building products.

Best learn-to-code platform I've encountered (by far). Do it!