For electronics, the book format is excellent. Analog design principles are not going to change anytime soon, and the Art of Electronics does an excellent job developing theoretical knowledge, an active intuition for what's going on, and provides a wide variety of samples.

Don't bother with the microconroller and part selection recommendations -- in my experience, those things were fairly out of date.

It’s interesting that it is still 99% relevant. It does a good job discussing fundamentals. There is also a companion workbook with solutions.

Another vote for this here. The 2015/3rd edition is recommended over older editions. The previous one was 1989!

Apparently, some elements present in the 2nd ed. were taken out from the 3rd edition to be put in a still unreleased "X-Chapters" book. (Source: Win Hill himself at the diyaudio forums.)

So now there are two fairly expensive books to purchase, that's a bummer. As of today I'll happily keep my 2nd edition; luckily electronics principles haven't changed much (at all) since, and new parts data sheets/app notes are freely available.

They took out the bad circuits section and that was it really. The 2nd edition references lots of obsolete logic families and pretty much skips micro controllers. Worth getting the 3rd edition.

Some of the content is word for word the same as the 1st edition (which I also have)