Simple .htaccess rewrite rules for static site

I have the following in my .htaccess file
```
<IfModule mod_rewrite.c>
	Options +FollowSymlinks
	# Options +SymLinksIfOwnerMatch
	RewriteEngine On
	RewriteBase /

# ------------------------------------------------------------------------------
# | Redirect to top level /index.php to the root (www)                         |
# ------------------------------------------------------------------------------

	RewriteCond %{THE_REQUEST} ^.*/index.php
	RewriteRule ^(.*)index.php$ /$1 [R=301,L]

# ------------------------------------------------------------------------------
# | Add trailing slash to urls                                     |
# ------------------------------------------------------------------------------

	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/|#(.*))$
	RewriteRule ^(.*)$ $1/ [R=301,L]


# ------------------------------------------------------------------------------
# | Remove .php-extension from urls                        |
# ------------------------------------------------------------------------------
	#This removes php extension
	RewriteCond %{REQUEST_FILENAME} !-d
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteRule ^([^\.]+)/$ $1.php [NC,L]

	RewriteCond %{REQUEST_FILENAME} !-d
	RewriteCond %{THE_REQUEST} ^GET\ /[^?\s]+\.php
	RewriteRule (.*)\.php$ /$1/ [L,R=301]

</IfModule>


# ------------------------------------------------------------------------------
# | Filename-based cache busting                                               |
# ------------------------------------------------------------------------------

# If you're not using a build process to manage your filename version revving,
# you might want to consider enabling the following directives to route all
# requests such as `/css/style.12345.css` to `/css/style.css`.

# To understand why this is important and a better idea than `*.css?v231`, read:
# http://stevesouders.com/blog/2008/08/23/revving-filenames-dont-use-querystring

<IfModule mod_rewrite.c>
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.+)\.(\d+)\.(js|css|png|jpg|gif)$ $1.$3 [L]
</IfModule>
```

Thanks @j-greig.
Where as a .htaccess would sit in the root - where does this stuff live in terms of the project directory and naming etc?
I’m Using valet locally.