Why is my camera getting such bad resolution? Could I need to clean the lens or something else?

be sure to press the shutter half way before taking the picture
this lets it focus

If the resolution (blocky looking, pixelated images) is the problem, then you're using too high of an ISO setting.

A dirty lens will cause washed out images or fuzzy pictures. Be sure you are holding the camera steady enough, as too many people smash down on the shutter button, causing camera movement.

If you do clean the lens, don't use any paper products, as they will scratch the delicate surface. Blow off any surface dust and use a clean soft cloth for best results.

Could be the camera specifications or you could have changed to a lower resolution setting which takes more pictures. Check your camera manual. Maybe you are taking pictures too far away with digital zoom in use (if applicable to your camera) or maybe you are out of focus (set auto focus or manual focus setting see manual).