Contrary to the self-help nature, "The Subtle Art of Not Giving a F*ck: A Counterintuitive Approach to Living a Good Life" has a set of somewhat structured ideas on how spending time/attention a bit more selective and sometimes going deep instead of broad gives you a better return on your efforts.

Say you're in a position where you can work on any aspect of a project, in any language, framework, SDLM, and with whoever you want. Some advice would be to learn new things all day long, but if you do that 100% of the time, you end up with a lot of nothing. Diversity is good, but not at the expense of in-depth knowledge, just like change is good, but change for the sake of change doesn't really do much by itself. Doesn't mean you should stagnate all development of course ;-)

As with all books on ideas and processes: it's just ideas someone else wrote, take what works, leave what doesn't work.