I just browsed through a few, including topics in which I know very well. These seem to be ~hour long talks on specialized topics. They seem comparable to a keynote address one might see at a scientific seminar. The topics are fairly niche, like an upper level college course. Picture of you just walked in on a grad level lecture of some random course you didn't know existed, like "The economic impact of health law and policy."

If you want to learn more, I'd recommend something like Khan academy, as it's designed for the general audience, and have topics that are a bit more introductory or general. Also, the production quality is better at keeping you engaged. The Gresham lectures are simply that: a lecture by a professor on a particular topic. They sometimes have a little bit of "death by PowerPoint" going on.

Although some lectures are interesting to everyone, like "life in the universe", many of the lectures have a less broad audience. Like unless you are into the history of technology you might not want to listen to an hour long lecture about Victorians' conception of space and time. It's very dry.

It's unsurprising that so few people are aware of these lectures. They aren't really marketed or aimed at the general public.

>i wanna learn stuff, but i am bad at assessing quality of information.

Lots of great universities have been trying to make their education accessible for free. Universities get paid for the credit courses - for gatekeeping quality and the prestige of the degree. So they don't mind as much letting people take the class for free when there's no credit attached.

Youtube has tons of recorded university classes available. For instance, here is a truck load of classes from MIT on their channel. You won't enjoy the benefit of a classroom with peers and access to the teacher to ask questions, but you can receive the same lectures the students get in the classroom.

Much easier than finding courses on Youtube, Coursera has tons of classes that have been contributed by universities, even top ones like Stanford and Yale. You can take most classes for free, and they ask for money if you want to receive an optional certificate at the end.

MIT has a similar program.

There's no shortage of free, high quality college course content out there. Sometimes it's just video lectures, sometimes you get all the homework, tests, etc. too. EdX and Coursera are the big names, but MIT OCW has a lot of MIT course materials and lectures available for download (varies from only lecture notes to all materials depending on the course).

Put on an eye-patch and snag some of the Great Courses series.

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See if anything interests you. Watch the class. Look up the subject matter and read about. Keep an open mind!

I've been watching them for years and they are excellent.

I have attended a few in person and enjoyed them.

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I have been watching the for a few years now. All are good though some presentation styles are not the same as others, so YMMV. I haven't come across any with shockingly great multimedia presentation, but then, these are for those who don't fall for fancy cartoons with swooshing sounds every 5 seconds.