Canon had tiers of DSLR cameras denoted by the number of digits in their model number, much of this has changed for mirrorless models.
Single digit models (xD Cameras) are professional models (1D, 5D, 6D, 7D, and many of those had generations denoted by "mark II+")
Two-digit models (xxD Cameras) are "prosumer," a middle ground of professional features and build quality and more consumer-focused features and build. (90D was the last model in that range)
Three-digit models (xxxD Cameras) are consumer cameras, each new model would have the most up-to-date features available to it and were solid cameras, but also had fewer buttons and controls and cheaper body materials. (The most recent model was the 850D). The 77D is technically at this tier even though it bucks the naming convention, but it's an 800D with more buttons and a second control dial.
four-digit models (xxxxD Cameras) are budget cameras, made with leftover outdated parts from other earlier cameras. Additionally, they are made of much cheaper plastics and unlike every camera above them in the product stack that have metal frames, these cameras have plastic frames, they are flimsy enough that they flex in your hand if you have a tight grip. The 2000D is the most recent, released in 2018, but some of it's components come from a camera from 2011, the 4000D is an even cheaper tier of camera, the 2000D at least had a metal lens mount, the 4000D doesn't even have that, and the sensor dates back to 2009.
I will never personally recommend a camera at the xxxxD tier, you are far better served with a used camera from the xxxD tier or above, because you'll have newer hardware and a more durable body that will last longer than a new xxxxD camera.