Basically enter 'localhost' on my small browser, I am come to XAMPP's welcome screen so things are installed properly.
What folder must i put my html files in?
It ought to be under XAMPP->htdocs.
My prediction is increase one folder and when the thing is something like
www, it will visit.
Normally, these preinstallers reconfigure apache to some htdocs(or webdir, public_html, www) folder, directly within the xampp folder. Look under
C:\XAMPP\xampp inside your situation