JavaScript shenanigans with user input

Hello everyone,
Im trying to create really simple page calculating users BMI and desired calorie intake for mass loss/gain. I'm just learning JavaScript so most of code in there is made with the help of YT examples, no way I could write that up myself.
I would be really grateful for any/all suggestions how to refactor my code and how to finish up BMI, current level and desired level of calorie intake. I'm really having issues in finding a way to wrap this up.
Here's my GH link:
https://klukas18.github.io/fitness-website/

Big thanks to everyone who read this 🙂
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