Question: things to do after installing linux elementary?
Answer: Run a System Update. Even when you download the latest version of a distribution – it is always recommended to check for the latest System updates. ... 
Set Window Hotcorner. ... 
Install Multimedia codecs. ... 
Install GDebi. ... 
Add a PPA for your Favorite App. ... 
Install Essential Applications. ... 
Install Flatpak (Optional) ... 
Enable the Night Light.