Q:Which camera do you recommend to an amateur photographer? is a Nikon d5200 fine?
The Nikon d5200 is a solid choice. Even though I’m a Canon guy, it would be a real stretch for me to recommend the Canon T4i over the Nikon.
The 5200 is a good physical size (although, pick one up and see how it feels in your hands to judge this for yourself), shoots at a ridiculously high resolution of 24.1 MP, has a fantastic auto-focus system and also has a few extra bells and whistles such as an articulating LCD.
More important than the camera body you select is going to be the lenses you purchase. Everyone told me the same thing when I bought my first DSLR camera and it took me a little while to understand that they were absolutely correct.
Assuming you stick with photography, the time will come that you decide to upgrade your Nikon to something else, probably a full-frame DSLR. Buy good quality lenses that are compatible with both the Nikon D5200 (APS-C spec) and full-frame Nikons and you will be able to keep using them in the future no matter what Nikon camera you may own down the road.