1,2, and 4 - check.
3. This may be simple to you, but I'm having a hard time getting my head around it.
First: Is the "?" in "jpe?g" a typo?
Second: What is RewriteRule ^ - [L] saying? Do nothing?
Third: The last 3 lines. I should replace these directories with whatever directories I have on my website?
PS: I have a lightly loaded website.