So, I have been using the Sony line of cameras since before they were Sony, when they were still Konica Minolta.
They've done a good job of making it possible, until quite recently, to use older lenses on more recent models.
And then there's the part where Sony made some of the first efforts with mirrorless and frameless cameras, which offer some incredible imaging, and at prices that actually put them within reach of, well, regular people without breaking the bank.
To be perfectly honest....when I was in school, I just couldn't afford Nikon or Canon, they were just too expensive for a poor college dude to manage, and they are STILL brutally pricey.
The glass is excellent, the lens range is just as wide as any other, and they have earned the accolades of many critics within the pro community.
For myself, all of that aside; I got into Konica-Minolta/Sony because 1- I could afford it, and 2- I like the very hands-on, kind of old-school feel and operability.
Most of the primary things one does on the fly are accessible with knobs and buttons, just like an old manual camera..instead of having to page through the menus on the LCD on the back of your camera.
And now that cameras like the A9, the 7R III, which bring us to the edge of medium format in a DIGITAL platform....well, I dont regret that I still use Sony and that most of my lenses are compatible, and that I am very comfortable with a Sony in my hands.
All that being said..... the camera itself is actually less important than the eye and brains behind it.
You can use any camera to train the eye and mind how to see and photograph... then worry about the next move on camera purchasing.
That Sony Alpha 6000 is a good camera to be going along with.