Trying To Help My Grndson

Grandson is 8 and has inherited a stamp collection from his other grandpa.

I'm not a collector myself but would like to help him. He's a little young to be doing research, collecting and cataloging himself but I'd like to help him understand what he has and how he could someday keep it going.

There is maybe 300 stamps or so from all over the place.

Is there some web sites that let you catalog what you have?

Not interested in selling anything, just trying to figure out best way to help him with it.