HTACCESS causes problem

When I removed this HTACCESS file below out of the WP core file directory or having none at all, the theme styles and functions seem to work properly but cannot get access to any other pages only displaying the front page. The new HTACCESS is automatically generated on every deleting not long ago after the previous deletion which brings back a normal access to all the pages BUT the theme style and functions are breaking instead. I have zero knowledge in the command/code within HTACCESS, please guide what it seems to be the problems with my HTACCESS below which have caused such problems and what’s your recommendation?

# Block the include-only files.
RewriteEngine On
RewriteBase /
RewriteRule ^wp-admin/includes/ - [F,L]
RewriteRule !^wp-includes/ - [S=3]
RewriteRule ^wp-includes/js/tinymce/langs/.+\.php - [F,L]
RewriteRule ^wp-includes/theme-compat/ - [F,L]

# protect from sql injection
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
RewriteRule ^(.*)$ index.php [F,L]

#disable hotlinking of images with forbidden or custom image option
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?domain.local/.*$ [NC]
#RewriteRule \.(gif|jpg)$ – [F]
RewriteRule \.(gif|jpg)$ http://www.domain.local/stealingisbad.gif [R,L]

RewriteEngine On
RewriteCond %{REQUEST_METHOD} POST
RewriteCond %{REQUEST_URI} .wp-comments-post\.php*
RewriteCond %{HTTP_REFERER} !.*domain.local.* [OR]
RewriteCond %{HTTP_USER_AGENT} ^$
RewriteRule (.*) ^http://%{REMOTE_ADDR}/$ [R=301,L]

# disable directory browsing
Options All -Indexes

# STRONG HTACCESS PROTECTION</code>
<Files ~ “^.*\.([Hh][Tt][Aa])”>
order allow,deny
deny from all
satisfy all
</Files>

# Protect the .htaccess
<files .htaccess="">
order allow,deny
deny from all
</files>

# protect wpconfig.php
<Files wp-config.php>
order allow,deny
deny from all
</Files>

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteRule ^(index\.php|wp-content/repair\.php|wp-comments-post\.php|wp-includes/js/tinymce/wp-tinymce\.php|wp-login\.php|index\.php|wp-admin/)(.*) $1$2 [QSA,L]
RewriteRule ^(.*)\.php$ /nothing_404_404 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress