study-groups VS awesome-lnurl

To avoid Anchor Bias, I suggest starting with Mastering Bitcoin by Andreas Antonopolous available here for free . It is necessary to see Bitcoin as an invention like Electric light, Automobile etc rather than one of the many "Crypto Tokens". Once you start with first principles, you realize that Bitcoin solved the question of decentralized trust, Why POW is crucial to maintain security and the decentralization and why every other token is keen to a startup or pump n dump using unit bias or affinity marketing. If you want to study in a cohort and meet weekly with other learners then check out https://learning.chaincode.com/

Coincorner fees aside, this works on an open standard: https://github.com/fiatjaf/awesome-lnurl

What you are looking for is LNURL. Electrum has LNURL not implemented it yet. You find a list of LNURL capable wallets and solutions here: https://github.com/fiatjaf/awesome-lnurl

Awesome things done with lightning's lnurl protocol

Yes use a wallet that supports lnurl-auth. Full list here: https://github.com/fiatjaf/awesome-lnurl

Yes, but sender is not required to use Strike. Also, it's Strike API, not Strike app, but API details are not public, likely you will be able to link your account with other wallets too. With LNURL it should be possible.

I really like all the new things that keep popping up, like Lightning Address, and the lnurl protocol

The lnurl protocol makes things extremely smooth and nice. Also you can use Lightning wallets for authentication, and so many cool things keep popping up all the time, like Lightning Address so that you can setup a payment through lightning to any "internet static identifier" like an email, telegram username, whatever.

This faucet uses one of the new protocols for lightning, lnurl, and it makes the transfer of Bitcoin with Lightning literally as easy as clicking a link.