The best way to learn is to learn by doing so we'll have you writing your first, basic Flask app by the second video.
Continue on and you'll learn the concepts needed to start writing your own cool Flask applications. The best part is you'll start to see how you can convert your existing CLI based scripts into functional web apps! (It's addictive!)
We do expect you to be somewhat competent in Python but don't stress if you're not an expert. Just do yourself a favour and have Python installed on your operating system.