Needing help decided which Nikon to get?

I am an amateur photographer trying to get better so I can become a professional photographer but need some help. I have a small dinky cannon camera but what to upgrade to something better. My dad has a Nikon D3200 that I am taking out tomorrow to try out but wanted to see some opinions. I am taking multiple classes through the community and once classes start again in August. Anyone have suggestions? Thank You!

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Can I point my Nikon d5300 up at the sun?

I've been into photography for a few years now and I just recently upgraded to a Nikon d5300. All of my other cameras have been "point and shoot" so they weren't very expensive. Now that I have a very nice dslr, I want to make sure that I take very good care of it. I've been trying to do some research, but haven't found any definitive answers.

And when I say "pointing it up at the sun" I mean at sunset/sunrise. I like to take a lot of golden hour photos. I already know not to point a camera up around the noon hour of the day. I have the Nikkor 18-140mm lens and the Nikkor 50mm lens, are these safe to use in the sun? Also, I do have UV filters on both lenses ( I know they don't do much, but I'm using them for protection right now until I can get some better filters)

Sorry if this is a novice question, but I just want to make sure I am doing the right thing for my camera. Any tips would be greatly appreciated, thank you.

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Why cant I upload my DSLR Photos on instagram?

I take alot of videos with this camera and people have been asking me for videos of their cars since january. I have incredible footage of things snd taken with my Nikon D3100 however when I trto upload the video to Instagram it tells me the file is unsupported. Why is this and how can I work my way around by still using my camera I have a Galaxy S3 so I cant use any iphone stuff.
My instagram is @coles_cars

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What camera part is this?

I recently got a Nikon d3200 kit and I don't know which part this is or what it does

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