I remade my landing page from scratch. Can you take a look?

Please test your landing page on mobile - it's very broken. this is something that I'm learning the hard way -- browsing habits have changed to 60% or more from mobile devices.

Explain "spaced repetition" is dead simple language. Try to summarize the core idea in 1-2 sentences.

Is this landing page supposed to be for a particular audience, eg educators? Because I'm still confused about what the tool does and how it's better than Evernote or a plain text file.