গিট সাবমডিউলগুলি কী এবং বিকল্পগুলি কী কী?

A SUBMODULE is a reference to ANOTHER Git repository at a SPECIFIC COMMIT, embedded in
your repo as a subdirectory:
  → the parent repo records WHICH repo and WHICH commit (a pinned reference, not a copy)
  → the submodule is its own repo with its own history
→ Used to include shared libraries/components that are themselves versioned repos.

git submodule add <url> path/to/lib    
git  --recurse-submodules <url>   
git submodule update --init --recursive 
git submodule update --remote