Gym

You should decide if your main goal is to build muscle or have great cardio endurance. Cardio might build a little bit of muscle in a completely untrained individual (everything builds muscle for a newbie) but once you have some training history behind you, too much cardio is counterproductive. Muscle is energetically costly for your body to maintain. If you're cycling for over an hour every day your body won't build large muscles as that's a waste of energy. Look at professional cyclists. They're usually small and skinny. Same as long distance runners. You should always do some cardio and rest days are good time to do it as it helps blood flow and recovery. Just don't overdo it. 30 minutes a couple of times a week is enough if your goal is to build muscle.

What for cardio? I was trying 45 mins cardio and 45 mins weights and stuff is that bad

Hi,
I’ve recently started the gym and I’m really enjoying it. I’ve been told that it’s good to have rest days and stuff. I’m trying to build muscle but I’m also doing cardio as that can be a form of building muscle, right? Anyway my question is can I do cardio every single day but not weightlifting if I want to build up muscle. By cardio I mean rowing machines, bike machines treadmill etc

Want to build muscle?
Lift heavy and eat a-lot.

If you're <20 then I wouldn't worry about Macros per say, but I'd just focus on eating a balanced diet in a slight surplus amount.
You can do Cardio everyday, but that won't build muscle. It will probably make you more toned by losing fat and muscle.

Wouldn’t stuff like cycling machines and rowing machines build muscle