Understanding Zaraz for dummies

I’ve read the docs, but I think they think I’m smarter than I am :frowning: I’m trying to understand the purpose of Zaraz, especially in regards to the tools GA4, Custom HTML, and HTTP Request.

Starting with GA4, am I understanding correctly that I can set it up in Zaraz, then remove the GA4 tags on my site?

If that’s correct, would the HTTP Request tool allow me to, for example, load jQuery, a local Javascript script, or my local CSS file without an HTTP connection?

Further, would the Custom HTML tool allow me to plug in HTML on every page? Presumably at the bottom of every page?