adding comments

Is there a way to select certain text and attach comments or notes to it like you can do in Microsoft word?

Annotations: command-shift-A. They have a different color and can be omitted from the document when exported. They look different from MS Word’s comments, but have essentially the same function.

There are also Note links, to other documents (I don’t know much about these 'cause I don’t use 'em, myself), and the inspector pane can hold document notes and links and keywords.