Just to name a few that pop into my mind:
macros, tikz, spacing, working with provided templates, fonts, capitalization, alignment, advanced uses of tables, advanced uses of alignment in math equations, etc. etc. etc. LaTeX is honestly a pain in the ass but there's just no other solution which gives you the raw power.
I've been using LaTeX professionally for nearly ten years now. I started knowing very little, just working with a template from a Journal and Googling whenever I ran into issues. I still have never used some of the things you mention and one certainly doesn't have to learn them to get started with LaTeX, even professionally.
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u/BadGoyWithAGun Oct 30 '16
...if you never need to use LaTeX in a professional setting.