I frequently see questions on Quora like “Which camera should I buy Nikon D3400 or Nikon D5600 or Canon 80D?”. Clearly the questioner needs help, but why did he limit his choice to these three models? There are hundreds of good cameras there, and I contend that if you don't already have a DSLR, you don't need one: mirrorless cameras are the way of the future.

Others can say it better than I. Here are some links:

dpreview guides

8 factors to look at before you choose a new DSLR or mirrorless camera

DSLR vs. Mirrorless Cameras: Which Is Better for You?

Compare cameras

DxO Mobile ratings

DxO reviews

SD card speed reviews

Camera size comparison

E-M1/2 with f/1.2 lenses

E-M10/3, E-PM2 with f/1.2 lenses

E-M10 against D3500

Oly, Pana, Leica SL

Compare 2 cameras in detail

Lens reviews

http://opticallimits.com/

http://imaging-resource.com/

http://www.lenscore.org/

http://www.dxomark.com/

http://www.dpreview.com/

http://www.cameralabs.com/

http://www.digicambuyer.co.uk/lenses

http://www.lenstip.com/

http://www.fredmiranda.com/reviews/

Olympus E-M1 Mark II

DxO: Sensor performance

DxO: Best zoom lenses

DxO: Best prime lenses