Nikon d5500 with 18-300mm or mirrorless?

I have never owned a dslr before but i have clicked a lot with my 20 yr old Olympus (manual lens)
Now i want to try the combination Nikon d5500 with 18-300mm f/3.5-6.3G lens. I prefer the zoom lens so that i don't have to change lens very often. If i ignore low light conditions, is this a good combo to buy? Any other dslr combo that i can go for in this budget?

Or should i go for a mirrorless cam. I want something at par with my dslr combo if i go for this option. Any suggestions?

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Aperture and f-stop for photography?

I have a nikon d5500, I still to this day don't really understand aperture and fstop. I know what they mean but I don't know how to set up a "perfect" picture by using it manually. Can someone please explain to me lol

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Where is the light sensor located in DSLR Cameras?

The reason why I ask, is because I am buying a entry level DSLR for beginners. I'm new to ISO, Aperture, and Shutter Speed. I'm buying a Nikon D3200 which I already put on lay-a-way. I know that the Nikon D3200 works great for taking pictures in daylight or really well lit rooms. But I am wanting to take night shots as well. I honestly don't know where the light sensor is located in DSLR's, I've been told that the light sensor is in the lens. I wanted to know if I could just buy a better lens for taking photos at night or just in darker situations, or is the sensor in fact inside the camera itself? Because I don't want any Noise/Grain in the picture.

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