Whenever I want to download and install new software on my computer I have to go onto google and type "how to install etc etc" I'm just curious how you guys know the PPA's. Where do you get them?
A PPA, or Personal Package Archive, is a collection of software not included in Ubuntu by default .
So When companies released an updates for their software , you can download them without waiting Ubuntu’s six-month release cycle .
PPAs were limited to programmers and testers, but Canonical opened PPAs to everyone in late 2007.
So when companies released updates you can find PPA on its website .
A PPA can be hosted anywhere- on any website. So you won't find a collection of all ppa's together in one place unlike the package repositories hosted on Ubuntu's servers worldwide, unless someone maintains such a repository(will be quite difficult to implement and update).
You could even host your ppa on your own website. See this question to know more on this:
So, yes unfortunately you will have to google(or search, in other words) to find ppa's for a particular package.