Command line

Google ``useful linux commands" and you will see many online resources for newbies, like this one.

Google ``How to XYZ Linux'' if you want to know how to XYZ. XYZ can be, e.g, how to delete a folder, how to view existing USB devices, and so on.

After you type in a command, Ubuntu often provides useful hints if it cannot find it. For example, it may suggest the command line for installing the missing command. So if your attempt was not sucessful, read the feedback carefully :-)

Useful ways to work with a commandline utility

Package management

Text viewer

Text editor

Text processing

Use multiple utilities