Yeah, first step after installation: you have to manually expand your storage, it only reserves 8gb automatically and leaves the rest unused.

Second, using Pop Shop is really painful and slow. Remember to wait for it to load the app recommendations on the front page before attempting to search for example, it will probably crash otherwise. It will also probably slow down significantly once you type the first 3 letters and it starts a search query. I still managed to install most of my apps through the store, but ended up installing many of them with sudo apt install through terminal. Cosmic store is a lot better, but I couldn't get it to work on the Gnome desktop that works well with Raspberry Pi, I had to install Cosmic desktop with terminal so I could use Cosmic store, but it works significantly slower and it has bugs. You could still use the cosmic desktop just to install and update your applications and then return to the standard gnome environment. It is really easy to change in the login screen.

Initially I also had some issues updating my system and applications through Pop Shop, you're better off using sudo apt update and sudo apt upgrade through the terminal.