Hey Valentine. Hope all is well. And welcome to the PotN forum. We have a great group here that is full of knowledge about most anything you'd care to learn about the subject of photography. Many, like me, are beginners to the digital world (I spent my youth on the fabled cameras that used something called "film"), but most here are ridiculously well versed in Canon's digital realm.
Now, on to your question: the Canon T2i/550D is one hell of a camera. It is capable of producing works of art. I have one right now and love it. It uses the full range of Canon's digital/automatic lense lineup (excepting for the new M series), and is capable of using certain older, manual film camera lenses via adapters (you can find more info on that scattered throughout the forum and the net). The image quality is vivid and sharp, yet flexible enough to manipulate in the various photo editing software that are in use today - from freeware to Photoshop. I find the viewfinder to be of a comfortable midsize, that is bright and sharp. The T2i's (U.S. name of the 550D) weight is very light compared to other cameras that are on the market, yet it is meaty enough to feel right with longer lenses attached.
I can highly recommend the 550D as a first camera. The operations are simple enough to grasp quickly, yet complex enough to help you get the shot you want. With the settings on "Auto" (green rectangle) you can take great snapshots, but turning the dial over to "Manual" (M) will allow you the breathing room to take photos like some of the ones that can be found in this forum.
If you have never used an SLR of any sort before, I would recommend either taking the course you have looked into or just purchasing a good book on learning photography, and using it while simultaneously trying out what it is teaching you while you read. Either approach would offer you a "hands on" learning experience that you need to really show you what your camera is capable of doing.
Good luck, and welcome to the habit, er...hobby.