People with disabilities are just like anyone else. Extend them the same courtesy as you would when you talk to someone else.
If you want to offer help, ask if he/she would like you to, and how you can help. Don’t feel embarrassed or offended if your offer isn’t taken up.
People with disabilities may use a device such as a wheelchair, walking stick or communication device to help them overcome their disabilities, and this is generally considered part of their body. Don’t play with, move, use or hang items on them unless they give you permission to.
Don’t be shy to offer to shake hands with a person with disabilities. Shaking hands with the left hand is an acceptable greeting too.
Talk face to face. That may mean sitting or getting yourself to the same level as a wheelchair-user.
If you don’t understand what someone is saying to you, don’t pretend to understand. Tell him/her that you don’t understand, or paraphrase what you think he/she is saying, and allow him/her to respond.