A few critiques.
1. Your base page doesn't describe what topics can or would be available. What are we trying to learn here? Languages? Science? How to be a better YouTuber? 2. You have a demo video. I haven't watched it. Why? Because I HATE having to watch videos if I could read a description instead. I read at least 10x faster than I can watch anything. That applies to learning as well, but some topics do work better in a visual medium. 3. You say its free but requiring me to sign up. To me that's not free. Maybe its not needing my money, but you're still needing my information. 4. Offer sign up/sign in with other identity providers.
TL;DR - Spend some time describing your product to someone who doesn't know need your product, not explaining it like I've tried other products and need shortcuts.
Thanks for your detailed feedback.
1. Yes, I'll be building a landing page to better place the problem we are trying to solve. 2. What do you suggest for this point? 3. I've received multiple feedbacks asking for a login-free access, so I am thinking around it. 4. Yes, for sure it's in my todo-list.
Understood your point about explanation.
I’m going to make some assumptions… I expect the account is for history, could you store that in a cookie initially, or local storage, and then invite people to create an account to carry history across different machines after they have watched some content maybe?