Care with guards: guards are preconditions (on withdrawal), whereas the conditions expressed here are only true after withdrawal (postconditions). Correctly: [amount == balance] and [amount < balance] is what you need.
Any time a woman makes a video tutorial on here there's non-stop criticism, no wonder there's a lack of women doing tutorials on YT. I like this music and the tutorial was very helpful for me!
That background music is way too annoying! Why would anyone think to have continuously looping generic background music during an instructional video???
This is probably a youtube feature issue. Music is so subjective that youtube should find a way to make it optional for the viewer and disassociate from the actual video