I have a few questions about mining.

How do I have multiple GPUs. I am wondering how you connect them I see a lot of motherboards with max 3 x16 slots. I see like motherboard with lots of x1 slot. Do you connect graphic cards to those?

Can I use different GPUs. I have a gtx 750 ti in my basement and I was planning on buying 1050 ti's can I use both my gtx 750 ti and 1050 ti's or do I have to pick one.

I am also wondering can your cpu and gpus mine or should I just mine with my GPUs.

Finally what coins should I mine.

I have a few questions about mining.

How do I have multiple GPUs. I am wondering how you connect them I see a lot of motherboards with max 3 x16 slots. I see like motherboard with lots of x1 slot. Do you connect graphic cards to those?

Can I use different GPUs. I have a gtx 750 ti in my basement and I was planning on buying 1050 ti's can I use both my gtx 750 ti and 1050 ti's or do I have to pick one.

I am also wondering can your cpu and gpus mine or should I just mine with my GPUs.

Finally what coins should I mine.

My real questions are how do a 1x pci work with a gpu and can I use my old GTX 750 and then different gpus or can I only use 1 kind

How do you mine those coins.

Also how do I setup GPUs to a pci x1 slots.

while using pcpartpicker. I can add 3 gpus. Does it matter if I get 3 1050 ti even though they are not sli? or does it just matter the amount of x16 slots on the motherboard.

When using PCPartpicker must the GPUS be SLI compatible or do I just need a motherboard with multiple PCI x16 slots

Well based off that chart a single gtx 960 would be profitable

HEY!!
My friend said to come here to learn about mining. I want to spend in the $600-$800 range. What do I do to make a profit mining? I know I can't mine Bitcoin or a big currency at the start but what rig should i get preferably around $650 and what coin should I mine. I am brand new to this so, all advice is helpful.
Thanks,
Sour