what are the main specs/papers to get a good technology understanding of eth2.0?

I have a reasonable understanding of the current state of the Ethereum technical stack (don't know what else to call it, which might reveal how unreasonable my understanding is after all).

Currently I am looking for good technical resources a out ETH2.0.

I have understanding about the EVM, PoW (IBFT, and some others) consensus, some of the implementation details of geth. I would like to get to a similar level on the changes that ETH2.0 implies with PoS, the Beacon Chain, Sharing etc. I know they are many different subjects, but when the yellow paper and Ethereum lite paper came out they gave me a good description of everything and I could always go to them for any doubts. What are some go to papers or technical specs to get an overall technical picture of what ETH2.0 looks like?