Most of the time, it's fine to allow anyone to push to and pull from the repository. However, for more important projects, you may wish to prevent new or junior developers from pushing to important branches such as dev and master. In those instances, the owner of the repository may restrict push rights to only a small selection of trusted developers.
For non-trusted developers, in order to make a change to dev or master, they must create a new branch (such as a feature or bug-fix branch), push to that branch, and create a pull request (PR). This PR is a formal request for their branch to be merged back to dev or master.
Pull requests are a feature of platforms such as GitHub and BitBucket, and ...
