I am a bit of overweight guy and I don’t know anything about lifting and fitness. I can’t go for strength due to very weak joints. (no loaded squats) I would like to go for body building or hypertrophy training. Some pointers, tutorials and links to resources are welcome.
As equipment goes I only have resistance bands, a bicycle and an outdoor gym.
Also how important is a diet in keeping myself fit?
You can’t outrun your diet.
In your case, you can’t out lift your diet.
You can lift weights 10 hours a day, but if you do not change your diet, it won’t really matter.