Fixed typos and added some clarifications

[TrainedMusician]

Description

What have you changed and why?

While going through the learning module I fixed any typos I spotted. If applicable, I also changed sentence structures for a better reading flow

Type of change

Minor changes to remove typos and/or add clarifications

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR

[TrainedMusician]

What is this seemingly random list? It's not part of the building blocks of OGC