Question: things to do after installing linux mint 18.3 xfce?
Answer: Choose and configure the browser. ... 
Install media codecs (if you forgot to during install) ... 
Check for and install any proprietary drivers that you need. ... 
Install Steam. ... 
Get jamming to Spotify. ... 
Back up your system with TimeShift and Backup Tool. ... 
Change your theme and wallpaper. ... 
Save your eyes with Redshift.