The terminal is a text window where you type commands instead of clicking.
The four commands to start with
pwdshows where you arelslists what is in the foldercd foldermoves into a folder,cd ..moves back outcat file.txtprints a file on the screen
$ pwd
/home/you
$ ls
notes.txt downloads
$ cat notes.txt
Try it
Open a terminal, go to your home folder and list its files. Then make a folder with mkdir practice, move into it and create a file with echo hello > hi.txt. Read it back with cat hi.txt.
If a command looks scary, add --help after its name. Most tools explain themselves.