How to merge a branch to main branch in Github.

In Terminal or Command Prompt: 

git checkout main [switch to main branch]

git pull origin main [grab latest updates from main branch]

git merge master merge [master branch to your main branch]

git push origin main [push your changes to main]

How to delete all commit history in GitHub & repush to main?

Create a new Branch:

git checkout --orphan latest_branch

Add your all the files:

git add .

Save the changes with commit:

git commit -m "commit message"

Delete Main Branch:

git branch -D main

Rename latest_branch to main:

git branch -m main

Force update the repo:

git push -f origin main

Git Configuration and Commit Command

Git Configuration :

git config --global user.email "you@example.com"

git config --global user.name "Your Name"

Commit comman for Mac:

git reset --mixed origin/main 

git add * 

git commit -m "This is a new commit for what I originally planned to be amended" 

git push origin main

Commit comman for Windows:

git add * or git add --all
git commit -m"first message"
git remote add origin "LINK"
git push -u origin master

How to Install Git on Ubuntu 20.04

sudo apt update 

sudo apt install git

The first thing you’ll want to do with GitLab is create a new project. This is accomplished by clicking the “+” icon on the toolbar. You’ll be asked for the project’s name, which namespace it should belong to, and what its visibility level should be. Most of what you specify here isn’t permanent, and can be re-adjusted later through the settings interface. Click “Create Project”, and you’re done. <a href="https://git-scm.com/book/be/v2/Git-on-the-Server-GitLab" target="_blank">More..</a>

<code>cd existing_folder
git init
git remote add origin https://gitlab.com/amisalabir/crudproject.git
git add .
git commit -m "Initial commit"
git push -u origin master</code>