Not bad,
I would say try and edit out the awkward pauses, you said there are no "components connected" on the bottom, I guess you meant to say "components placed", when you are talking about the IC's you need to make sure you are talking and pointing to the right component, I knew what you were referring to but you were still pointing to the memory when you said "this is the main microcontroller", might be confusing for some beginners watching.
Just a few observations, you will get better the more you do, it's a good start, the rest of the video was fine, audio was clear, a few focus issues which most YTers have when showing things close up due to the camera response so nothing to worry about there, it might be worth post editing to show the IC identifiers at the right point in time in text on the video.
You may want to look at an intro and perhaps some kind of watermark on the video, could be text or a logo if you have one just so if people rip your videos you still have your mark on it, none of these are "important" to the content but just some thoughts.