Your avatar is really cool, I like it
Also very cool video, can't wait to see your next video! Subscribed.
If you're going to continue doing videos like this one, I would stick to cross dissolve as I use it all the time when doing explanation videos.
But, if you're doing videos where you have to do cut aways for product demonstration, then back again I would recommend a cool custom transition like steel doors closing, or lense flair, etc.
Even for just doing an intro description, then doing the video then back again for the outro you could do a custom transition as well.
I'll give you an example based on your first video. Let's say your next video is going to be an outdoors hiking video.
intro -> Hey everyone, it's Amy and today we will be going hiking in (insert place here), so let's get going!
transition -> dip to black, show channel logo, zoom in to logo, cut to video hiking
video -> talking, explaining, showing the landscape, etc.
transition -> dip to black, show channel logo, zoom logo in, cut to outro video
outro -> Thanks for watching everyone, tomorrow we will be going to (insert place here) for some more fun adventures, so be sure to subscribe so we can continue our adventure together!
- insert outro card with watch previous video, show subscribe button with link.