git is a Distributed Version Control systems that stores data in a file system made up of snapshots
the most important poins in get are :
Snapshots
Local Operations
Tracking Changes
minimize Loss of Data
Files in Git can reside in three main states: committed, modified and staged
to use git you must download it and there are three way to use
1- Install as a package
2- Install via another installer
3- Download and compile the source code.
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and there are some of command can use it with git
at this figure some of it
for more information you can visit this link Git Tutorial