Adding "stuff" to a list

Hi all! Not sure if this is the right forum, still trying to get my bearings on this site (and with Tess.)

I need to learn how (or if) I'm able to add things globally based on a list. I need to add a note to a group of constituents currently, but this is a question for other areas as well, such as attributes and even bringing in an external list to globally add contributions to a list? Any of these things possible? I'm not a SQL person (yet) and have very little access to anyone who is, so looking for options from an end-user perspective, if such a thing exists. 

Appreicate your time!

Jen

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