Do you know some "hacks" in c++ for a better optimization, and ease to work with?

Question

The question does not refer to functions from specific libraries or assemblr functions... Only usual type of code sequences.
I ask for these because I, as a student, don't want to reinvent the wheel, but go further

Answer 1

A good way is to study patterns and known algorithms.

Answer 2

Or ... are you refering to non coding hacks, like, how to set up a better development environment?