Hey @Collins_Kariuki,
There are plenty of ways to increase your knowledge and practice what you learned in the course. One of the ways, of course, is to try to do a personal project using MongoDB. Our Developer Center has a wide range of tutorials, videos and code examples that you can go through and build something with MongoDB.
Additionally, we also have a MongoDB Bytes section in forums that you can go through to practice basic and advanced MQL, Aggregations, and other concepts through articles and quizzes. Linking a few quizzes for your reference from the MongoDB Bytes that you can go through and practice:
Practice Basic MQL
Aggregation Challenge
There are other resources too that you can refer to increase your knowledge of MongoDB like reading the official documentation, or trying to complete one of the developer paths in our MongoDB University. They contain labs and quizzes that you can try to further increase your knowledge.
Please let us know if there is anything else you need suggestions or help with. Feel free to reach out for anything else as well.
Regards,
Satyam