Tell us about your VERY FIRST dulcimer
General mountain dulcimer or music discussions
Look inside the rear soundholes; there may be a maker's label visible. Beautiful instrument, as Dusty says it is build for more traditional playing since it has no 6+ fret and traditional wooden pegs. I've attached three articles I wrote for new players.
The first is called I Just Got A Dulcimer, Now What? It's an illustrated glossary of dulcimer terms (so we all speak the same lingo), plus answers to many beginner questions about the tuning, playing, care and feeding of your new acquisition.
This one is an introduction to playing Noter & Drone -- one of two or three traditional ways to play (the others are Fingerdancing and the rare bowing)
https://fotmd.com/forums/forum/dulcimer-resourcestabs-books-websites-dvds/15049/get-noterized
The other attached file is all about the older Modal style of tunings (not the modern DAd, although it's mentioned) and how they relate to the diatonic (non-chromatic) fretboard of the traditional dulcimer.
As Dusty also says (he steals all my good lines) Ask questions, and if we don't know the answer we'll make something up!
Enjoy your dulcimer journey!

You are going to get tons of advice from this site, and some of it might even be helpful!