All day long i couldnt install a single software in linuxmint [on hold]

so basically guys , i installed linuxmint cinnamon 19.1 today first time using linux ever and i liked it so much except i couldnt install any software i tried snaps but in linuxmint there’s no gnome so i had to do it the terminal way and once it says installed i wouldnt find it in the menu or anywhere else but when i give the command : snap list , i can obviously see the software there. also there are so many errors that appears to me in different occasions when installing a new software…..in a nutshell guys, i need someone to help me deal w the terminal thing urgently pleaaaseee thnx in advance