maybe start with the talks and papers of Ethereums Decvon 1 and 2
and especially vitaliks, gavin woods.
Devcon 3 will take place in early november, Cancun Mexico
(https://www.youtube.com/user/ethereumproject/videos)

you could also look into the consensys meet up
https://www.youtube.com/channel/UCBeLEwM-yhIKuIxHTx0VzdQ/videos

r/Ethereum and r/Ethtrader are good places to keep updated on the progress.

Hive account@crypt0 is a passionated ethereum enthusiast and youtube vlogger, who is keeping his audience up to date on ethereum and other crypto's.

maybe you should first learn about ethereum and investigate it's internal projects and it's competitors later.

additionally the ethereum blog :
https://blog.ethereum.org/