I learnt about whiteboarding in technical interviews. Can the same steps be applied to when you are just completing course content on Codecademy?
Why not try it and decide for yourself? You’ll know for sure that way.
Whiteboarding is the process in a technical interview which you have to solve a problem without a text editor. Can the same process be used for general problems(Codecademy in platform projects)?
Unless it is explicitly forbidden at your location, I don’t see why you couldn’t. Whether or not you want to, or find it effective or efficient is entirely a matter of personal preference as @tgrtim suggested.
I should when I’m working with no guidance because it helps me break down the problem and understand it more.