GitHub Private Repos and their limitations:

Advantage :

• We can create any number of private repo's.
• Maintainability is easy
• So we can manage our code privately like other repo like gitlab and bitbucket., etc.

Disadvantage :

• We can't create the free private repo's for organisation.
• free private repo's can't create the gh-pages.
• Only 3 collaborators only add in free private repo's.

Link : https://github.com/10secondsofcode/10secondsofcode