Hi
@Chefinthesky . I appreciate that you were never going to use the above video for promotion...that it was just for fun and a vehicle to gain experience of post production. In that respect your video is good.
Please allow me to give you some pointers keeping in mind that there are people around that are better than me at this game.
First, it is important to have hardware available that can handle video well even up to 4K. I note that you edited that video using a duel core i5 machine. That was painfully obvious in your video: it simply wasn't up to it. I fear, though, that even a quad core machine may struggle with 4K unless it has a very good graphics card. I say this because up until a few months ago I was using a quad core machine and that struggled with 4K. I now use an eight core machine with 16gig memory with a two TB hard drive and a true 4K capable graphics card using my 4K TV as its viewing device. Now I can work with 4K material without issue.
Second, Your choice of editor is a factor in the finished product. You may use one particular editor that you like but still get some stuttering in the final render...even if your computer is a powerful enough one. The key, then, is to experiment with different editors until you find one that you like using and spits out a good render. It may finish up being one of the free ones available or one you have to pay for, but all the paid for ones have free demo versions for you to evaluate before buying. After trying several myself I finished up with Filmora. Not the most sophisticated editor out there but it was an easy learning curve and gives good results so it ticked all my boxes.
Third, A good video will become better if you plan your shots with the edit in mind...simple as.
I could go on but this post is long enough already