Help me understand why we have seasons.?

I know this may sound like a poor question, this is not for school just general knowledge. The earth orbits around the sun from the same distance at one revolution every 365 days. It also spins once per 24 hours. If we are the same distance from the sun all year, and we just continue spinning around I don't really understand why the seasons change. I think it has to do with the equator but I don't understand why. I'm guessing the north part of the earth is where like distance farthest from the sun at all times in accordance to the earth's axis and the south would be the closest? and why is the equator always warm if that's like the line in between the axis? I'm guessing some of my info may be incorrect and if you can help me constructively I'd appreciate it.