

You’re right about it being more of an aggregator. I think having a good aggregator is about as important as the sources. To be more informed, hearing the news from different perspectives is essential, I feel.
For actual sources, starting internationally is a good bet to get an outside perspective of what’s going on in your country. I feel that the BBC does a great job of covering US news for that reason. Al-Jazeera is another international source that is decent for most news in the US, but has notable biases for issues in the Middle East as far as I am aware.
For more domestic US sources, PBS and NPR are the gold standards and worth supporting since they are public broadcasting networks. The other major news networks have more notable biases since they are privately owned.
For business news, Axios, Forbes, and Yahoo Finance do a decent job.
I would say CNN probably still is mostly left leaning (relatively), but they have had a lot more right wing stances over the past five years than they did the previous decades.
I believe you used those terms correctly, although offline people would tend to say it more as economically conservative for that second part, in the US.