How to write rules for htaccess in my case?

Question

System administration

I need help, I've spent the whole weekend googling here on such issues.
You need to teach the site to work according to the rules that are written through htaccess (this is the best option)
#1
Instead of
site.ru/page.html/
Redirect to
site.ru/page.html
#2
Instead of
site.ru/catalog
Redirect to
site. ru/catalog/
#3
Instead of
site.ru//catalog//
Redirect to
site.ru/catalog/
#4
Instead of
site.ru/index/
Redirect to
site.ru/
#5
Instead
of site.ru/blog/name-blog /page1/
Redirect to
site.ru/blog/name-blog/
PS I understand that I ask a lot, with me for a beer!
PSPS By the way rule #2 did

RewriteCond %{REQUEST_URI} /+[^\.]+$
RewriteRule ^(.+[^/])$ %{REQUEST_URI}/ [R=301,L]

Answer 1

And by such words googled?
www.google.ru/search?q=%D0%B3%D0%B5%D0%BD%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80+%D0% BF%D1%80%D0%B0%D0%B2%D0%B8%D0%BB+htaccess

Answer 2

#one

RewriteCond %{REQUEST_URI} \.html/$ [NC,L]
RewriteRule ^(.*)/$ http://site.ru/$1 [R=301,L]