i mean growing big is eventually unavoidable

So i finally had access to a cheap gym. First time in my life i entered a gym.

1. Is it normal that the machine make a lot of noise when i release and drop the weight? The load of the machine collided because i released a little too fast and it kinda made some noise i dunno if it will spoil the machine.

2. What about the tempo of pushing and releasing the load? I saw on video tutorials those people usually carry the load and release slowly, but in the gym, i saw some of the other ppl doing it fast. I find it easier to do more when i do it fast too.

3. There was this leg pressing machine and when i used it, i tried to reach my maximum by setting it as heavy as possible. But when it reaches around 80 kg, when i push i feel the pressure in my knees, there was no pain but i can feel the pressure, i assume this is bad for the knees, no? Is it suppose to be like that? Cause i dont wanna end up having insufficient joint liquid when my time comes, like many sports athletics, our body cant secrete joint liquids right?

4. My friend told me that he needs to exercise in the gym to help recovering from his sports injury. So something is new here, i thought our body is suppose to rest while waiting for the injury to recover. How does gyming helps recovering an injury?

5. I am eating 3 eggs every day i work out in a gym. Is it enough?   

6. Sometimes when i work on the abs loading machine, instead of feeling the pressure on the abs, i feel part of it on my legs too, is that normal? Or does it means i am doing it wrongly?

already explained...I shouldn't be saying this. but i am new to this field, and i have things i dont understand. so i guess it explains everything, right no?

What i type in the reply, is a reply. Its really not a good idea to start reading from a reply.