Looking for a relatively cheap camera to start out and learn the ropes of "proper" photography with

Heya peeps :)

I've been on-and-off interested in photography for a while now since I was probably around 11 (I'm now 17) and I've decided I want to look into getting some kind of DSLR camera, mainly to learn the ropes of the whole aperture/shutter speed malarkey.

At the moment, I'm using a Nikon Coolpix B500 which is a pretty cool bridge camera, though I find myself kind of restricted by it. I've used my uncle's Canon Something-Or-Other on a holiday a few years ago and found it awesome, and I want to pick one up for myself - but I have absolutely no clue where to start.

After using a phone and bridge camera for so long, I'm super confused by pretty much every aspect of "proper" cameras. I'm eager to learn, and I think the best way to go about doing that is to jump in at the deep end and figure things out as I go.

I was originally looking at picking up a second-hand Canon EOS 800D from eBay after seeing a number of people recommend it on Reddit and such, but noticed that they're all just a little out of my price range - I'm looking to spend ideally around £200 (US$250), maybe slightly more if needed, but the 800Ds seem to sell for upwards of £350 (US$430) (some coming with lenses, some without).

In short, I'm looking for something that can be had for fairly cheap, but will teach me the basics and how to work my way around photography (and potentially videography too, but I'm not too sure just yet). I notice I tend to take photos of streets and buildings, and occasionally landscapes, if that makes any difference whatsoever. I also like that sort of dreamy, almost film-like style.

Edit: just thought I would add that I'm not dead-set on getting a Canon; I'm open to getting any brand, as long as it's not wildly different :)

I've kind of rambled here, but I'm happy to give any more info if it's needed :)