Can someone please advise what tools to use for these issues?

I am new to SEO and looking for some help. What tools (preferably free) can be used to check the following issues?

1) Missing redirects

2) Pages 404ing

3) Server errors (is this the same as 404ing?)

4) Bad requests ( how is this different than server errors?)

5) Broken back links

6) Mobile site styling missing in search crawl

7) Schema errors ( can someone please explain)

8) javascript issues

Any help is really appreciated!

submitted by /u/tbk125
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