Ask HN: Two kids (8, 9.5), two weeks, “learn to code”. Tips? Tricks?

Between the two of them, they can operate PC, iOS and Android devices. Know how to signup, log in and out of accounts. Have worked with Google Slides, edited videos for Youtube and reskinned their Minecraft characters. They can type (slow) with looking at the keyboard. They have played with Scratch, Minecraft redstone/commands blocks. They google their problems and watch Youtube for instructions. Their math/geometry is 3rd/4th grade level. They want to learn "to code" specifically "Javascript". We have two weeks and we'll have to watch the Minions movie in the middle...

Tips? Tricks? Ideas? Watch for? etc. much appreciated.