How to write mod_rewrite rules?

Question

Apache HTTP Server

There is a mini-site (8 pages) on site.com
All files (index.php, products.php, etc.) are in the root directory.
The phpbbex forum is also installed in the site.com/forum folder
Tasks:
1. Get to site.com/support.php from site.com/support ( implemented in Rule1 )
2. Redirect to site from site.com/products . com/products / , and land on site.com/products.php .
3. From the address site.com/products/products to get to site.com/products1.php (like implemented inRule2 , but Google Analytics writes 2 different links in the reports: /products/product1 and /products/product1 / depending on which url to go to, and I want only /products/product1 to remain.
4. From the address site.com/products/product1 / redirect to site.com/products/product1, and get to step 3
5. To open the forum at site.com/forum
My .htaccess:

Options FollowSymLinks
RewriteEngine On
RewriteBase /

ErrorDocument 404 /404.php

RewriteRule ^([a-z\-]+)$ $1.php #Правило1
RewriteRule ^products/([a-z\-]+)/?$ /$1.php [L]  #Правило2

Thank you!

Answer 1

http://www.generateit.net/mod-rewrite/
http://beget.ru/art_mod_rewrite
http://habrahabr.ru/company/sprinthost/blog/129560/
At least we tried to figure it out ourselves before asking baby question? There are millions of examples and online generators of such rules on the Internet.