How to make friends 2 parts of the code?

Question

Apache HTTP Server

Hello, I can’t make friends with the following 2 parts of the code:
1) Redirect from http to https

RewriteEngine On
RewriteCond %{SERVER_PORT} !^443$
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R,L]

2) Removes at the end of the extension address

RewriteCond %{REQUEST_URI} ! \.html$
RewriteCond %{REQUEST_URI} ! /$
RewriteRule ^(.*)$ $1.html

I try different combinations, but in the end 500 error. Who fumbles in the backend please help.

Answer 1

.htaccess is very well described here for most needs.