Here are some links that will prove useful to learn about the Polkadot ecosystem.
Polkadot Community calls → https://youtu.be/v9bB3Khm-Hk?si=dLjOcAJFSo7UFJJj
The Kusamarian community news & interviews → https://www.youtube.com/@TheKusamarian
DotLeap newsletter → https://newsletter.dotleap.com/
Polkadot newsletter → https://info.polkadot.network/subscribe
A list of all tweets from Polkadot Parachains → https://twitter.com/i/lists/1461403404580925441?s=20