Start with Lemmy feeds. Open a community, sort it by, let’s say, top-day posts, and copy the RSS button link. Here we are - top posts for 24h for a community you like but in RSS. I am subscribed to Ukrainian National Bank news, Kyiv Subway (Metro) non-urgent news, the news feed of our president, few government ministries. All this is to keep up to date with government regulations. Then there are a few developers and IT and Tech portals with worldwide news for their fields - top for the day, top for the week, and top for the month in separate feeds. Anandtech, for example. I used to be subscribed to a few Twitter accounts by RSS via a RSS-Bridge, but it’s gone now. A few vendors for the products I like. A few VR portals as I have an Oculus Quest 2 VR headset. Unraid news, as I own one. Thinking of moving email GitHub releases subscriptions to RSS. I can continue if you want.