I've been going around for a few days trying to find a tutorial that doesn't absolutely confuse me on how to mouse pick using raycasting but have had no luck.
Most of the time I get confused as to what I'm doing because I don't get enough information on what it's currently showing me.

So I've come here to ask someone to teach me(In detail if possible so I can understand as much as possible) how to mouse pick using raycasting.

I'm just here to learn so I can get better at my programming because I'm not even close to mastering it like a lot of you answering my questions lately; I don't have a lot of time during my day to spend on research for things like this so please be patient with me if I don't know something that you do.

If it helps anything I'm learning OpenGL from here: http://lazyfoo.net/tutorials/OpenGL/