How to upgrade composer, if installed version is too old

If your composer version is too old and not able to upgrade due to self-update command not found, follow video steps and upgrade your composer

Steps explained for Ubuntu and Windows operating system

Composer Allowed Memory Exhausted (PHP Fatal Error), How to Solve (Urdu/Hindi)

How to update/upgrade composer version (Urdu/Hindi)

how to solve composer detected issues in your platform