This is pretty simple tutorial for update gitlab or github.
So I won’t tell you how GIT work. If you want to learn rigorous and precise.
This web way help:https://gitbook.tw/.

Step 1: Build a git place and push on it.

1-1:

You have to build a Repository or a Project on gitlab(or github)
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1-2:

Make sure you have installed the GIT on your device. Then open the commander
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1-3:

Use “cd” to link your files location.(If you didn’t know the DOS command,this web may be help:https://en.wikipedia.org/wiki/List_of_DOS_commands)

cd location #location is your file link
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1-4:

git clone url

Key “git clone url”,the url is your Project clone link and it may ask you to log in the website. gi4

1-5:

git push

Key “git push” and the local project files will be pushed on the git web! gi5

Step 2: Update the git files.

If you want to push your updated files on git web. You should cd to your git location at first.

2-1:

git add .

After cd to your git location, key “git add .”,then it will check the updated clone files. gi6

2-2:

git status

Key “git status”, it will show you what’s files be updated. gi8

2-3

git commit -m 'update'

Key “git commit -m ‘update’”, you need to announce the “commit name”. The ‘update’ can be changed by any string you want to call. gi9

2-4

git push

Key “git push”,then the files will be pushed on git web if your git files is legal. gi9