Some basic questions about LaTeX/Advice on how to learn

Question

I want to learn how to write math using LaTeX. I have a mac and have downloaded MacTex. I have used https://math.stackexchange.com and have learned the very basics of writing with MathJax and I liked how when I wrote, the displayed formula came up right underneath

I have tried producing this same equation in LaTeX and got numbered equations instead.

So my questions are:

How do I write without the (1) and (2) in LaTeX?
Can I/how do I program LaTeX to display the formulas typesetted nicely automatically (perhaps beneath the raw text, like in MathJax) instead of constantly clicking the Typeset button?
Where is a good place to learn (so far I have been using https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference to look how to write symbols I need).

For question 1: Use align* environment instead of align. — , Jan 13 '19 at 15:56
Welcome to TeX.se It's not clear to me whether you want to learn more about LaTeX or MathJax (which is not LaTeX but uses a TeX-like syntax and is off topic here). For learning LaTeX there are lots of good options here: What are good learning resources for a LaTeX beginner? — Alan Munn, Jan 13 '19 at 15:56
For question 3: You can read LaTeX for complete novices or The not so short introduction to LaTeX2e, or you can learn some basic on Wikibook. To learn about particular packages, read those package documentations. — , Jan 13 '19 at 16:01
For question 2: LaTeX is somehow a computer programming language, its outputs are the documents. So it should be coded and then compiled. You can use Overleaf's automatic compiling feature, or use LyX, but I don't really recommend you to do that. Generally, we should not compile our document too often. — , Jan 13 '19 at 16:03
Can we close your question as a duplicate of the link in my comment? — Alan Munn, Jan 13 '19 at 16:47

Some basic questions about LaTeX/Advice on how to learn

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