There are several issues related to participles. You can find them discussed in the pages listed and linked below.
This page answers three questions:
By the end of this page you will have a deeper knowledge of the various functions of the present participle.
I have made an effort to make the explanation both simple and clear. Remember that you don't have to master all the functions in one sitting.
You have two pages here on this verbal:
The page on forms explains how the past participle is formed; and therefore, how you can recognize it.
The page on functions explains the work of this participle in sentences and the meaning it conveys.
When this page comes, it will help you to recognize and avoid errors like dangling participles. It will also deal with some related things which look like errors, but aren't.