I own a Canon EOS 1100D camera that was released in 2011. What lenses are still compatible with this model?
Canon EF lenses: All of them. Every single one made since 1987 when the EF mount was introduced.
Canon EF-S lenses: All of them. Every single one made since 2004 when EF-S lenses were introduced along with the EOS 20D.
Other lenses made by third party manufacturers for the EF/EF-S mount: Most of them made since the older camera in question appeared on the market. There are sometimes compatibility problems with older third party lenses and newer EOS (or Nikon, or Sony, or Pentax, Panasonic, Olympus, etc.) cameras. You would need to research a particular lens to see if any compatibility issues have been reported with your camera. Most are fairly well documented and easy to find with a proper internet search. In general you shouldn't have to worry about any third party EF lenses released since around 2011 when your EOS Rebel T3/1100D was introduced.