A question posed at the nForum asked for a roadmap to learn Lurie's Higher Topos Theory, including helpful sources other than HTT itself (to read along it) and information about which parts of HTT should be skipped (example guide).

This question asks for a similar guide for learning algebra in the context of $(\infty,1)$-categories, at the level of generality of Lurie's Higher Algebra.

More specifically, the focus should not be on DG-algebras, being instead about more general mathematical objects such as $\mathbb{E}_k$-rings.

Here is the sister question to this one, which asks for a roadmap to Spectral Algebraic Geometry.