How to handle changes on files on git source control before Pull last

Question

I'm beginner on git source control I have web application done by angular 7

exist on git source control

AND I need to pull last changes to be same changes and files on local and server same .

so I will write

E:\PartDetails> git pull origin master

but I notice I have 7 files changes on angular files so

What I do on files changes before Pull last changes to web application files from server ?