[halayli]

Being coherent, succinct, and articulate is an outcome/reward that you achieve as a result of learning and hard work.

Try improving your learning skills, and focus on your cognitive map you've built so far and identify the gaps/holes.

In general, if you are having a hard time explaining something it simply means you don't fully understand the topic. But that's fine, I often say something along the lines of "I am not doing a great job explaining X as I am still learning the topic and have gaps in my knowledge about it". Self awareness is key here.