Author here. I've been designing a local-first data layer for most of this year, and I kept having the same conversation. I'd say "local-first" and people would hear ownership, or offline, or speed, depending on where they first ran into the word. So I wrote down where the three meanings come from and why they split.

There are five demos in there too, one for each idea. Playing with them as you read is half the fun.

High level summary article

More detailed article

In June, the Python steering council announced that it was pausing work on the JIT in CPython's main branch until there was an accepted Python Enhancement Proposal (PEP) that addressed concerns about maintenance, compatibility, and set clear success metrics as well as a timeline for completion. [....] After months of discussion, the JIT maintainers have withdrawn the PEP. For now, it appears that development on the once-promising project has come to an end

What do I need to learn in order to do it?
I want it to functionally similarly to this but with a different so I can start my portfolio. All advice is appreciated, thanks in advance.

I have followed Scott for some time because of his contributions to the fsharp learning community. He's website fsharpforfunandprofit.com is one of the best programming article websites. This talk especially is very good. I think Scott is very good at breaking down complex topics to make them seem approachable.

Because people won’t pay for it.

This is an issue I know well. I was on the Windows 3.1 team at Microsoft. I wrote the book No Bugs. I founded and built the software company Windward Studios.
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ps - I think this meets the subreddit rules. If it does not, apologies and please delete it.