May I modestly suggest you start with
It needs updating to take in the latest developments but the information is mostly current.
Then you might move on to the excellent:
And if you want to get into the nitty griitty, the equally excellent but more technical:
There’s also the MaidSafe blog of course https://blog.maidsafe.net/, and the founder’s blog https://metaquestions.me/ .
Edit: … and I forgot one: SAFE Network for Dummies