If you want to make sub folder in your git repository like git/firstrepository/subrepository. you simply copy the url of repository and paste with "git submodule url".

if you want to delete sub folder of your repository file.you just a command git submodule remove command.

Adds a new submodule to your repo

Initializes submodules listed in .gitmodules

Clones and checks out the correct commit for each submodule

Clones and checks out the correct commit for each submodule

Clones and checks out the correct commit for each submodule

Shorthand to init and update in one go

Initializes and updates submodules and any nested submodules

Syncs submodule URLs with .gitmodules

Syncs submodule URLs with .gitmodules

Syncs submodule URLs with .gitmodules

Runs a command in each submodule

Displays current commit and status of each submodule

Unregisters a submodule

Removes submodule from index

Deletes submodule folder (manual step)

Deletes .gitmodules if no submodules remain

Shows summary of changes in submodules

Manage submodules.