clarify two more concepts; closes #311

Author: bast

content/same-repository.md

@@ -329,3 +329,17 @@ To protect a branch in your own repository, go to "Settings" -> "Branches".
 - But we successfully contributed to a **collaborative project**!
 - The pull request allowed us to contribute without changing directly:
   this is very good when it's not mainly our project.
+
+:::{discussion} Let's clarify typical questions
+**What is the difference between `git pull` and a pull request?**
+- `git pull` is a command that fetches changes from a remote repository and
+  merges them into the current branch.
+- Pull request: change proposal. It might have been named this way because
+  after you accept a pull request, internally it git pulls the changes from
+  the branch containing the change proposal.
+
+**What is the difference between a pull request and an issue?**
+- Pull request is a mechanism to suggest and review changes.
+- An issue is a place where we note and discuss problems or ideas.
+- Both get a number and they can reference each other but that's all they have in common.
+:::