Header footer and includes

Hello Community,

I am back with wappler and started building my first page with index.php / header.php + footer.php as server side includes. I am using Bootstrap 5 local and added it with all 3 pages (index/header/footer) at first.

With Joomla 4 I was able to add includes with header at one place globally for all pages. Therefore my thought was, to activate Bootstrap only with my header.php. Since I will use my header on pretty much every page, I assumed Bootstrap 5 would be included for every new page along with my header.php.

Basically I am asking:

1. Do I have to activate Bootstrap 5 for every new page or …
2. Is there a way to apply something like Bootstrap 5 or else globally, so I don’t have to include for every new page