Aggregation by Key Words?

Hello, and sorry for a newbie, dumb question, but here goes. On part of my site I would like to aggregate/curate news on a certain topic by “key” words. I have been trying RSS multi-importer which says I should be able to do this; however, for what ever reason after numerous installs and uninstalls I am not able to make it work. Likely the problem is with me.

Can anyone tell me what they use to do this? I am not code literate, so it needs to be something that I can install easily with shortcode, or perhaps a plugin that I haven’t found. Again, I would like to pull in articles from specific publications only when the article has a “key” word that I select.

Thanks.

Elliot