timed fading on and off for LEDs

Hello, I don't even know where to start building a sketch for an LED project. I have 4 channels (pins) of LEDs and would like them to fade on, stay at a set maximum, and then fade off. I have tried several different sketches from different sources and none of them seem to work like I would like them to and can't figure out where the issue is in any of them. I would like to do something like this:

at (time) begin to fade up from zero to max; reach max at (time); stay at max; at (time) fade down to zero; reach 0 at (time);

Any help would be greatly appreciated

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