Yep. The following can be descriptive (y dyn hwnnw "that man") or independent/pronomial (Wyt ti eisiau hwnnw? "Do you want that?"):
hwnnw = that (masculine)
honno = that (feminine)
Those can be quite formal, so there are alternative independent versions which are more everyday/informal:
hwnna = that (masculine)
honna = that (feminine)
There is also independent:
hynny = that (abstract, e.g. this situation etc.)
Another, mostly northern version of this is:
hynna = that (abstract, e.g. this situation etc.)
When describing in informal language, you use yna "there".
All in all that give you:
"that man" - formal: y dyn hwnnw, informal: y dyn yna
"that girl" - f: y ferch honno, inf: y ferch yna
"What is that?" (masculine) - f: Beth yw hwnnw?, inf: Beth yw hwnna?
"What is that?" (feminine) - f: Beth yw honno?, inf: Beth yw honna?
"What is that?" (abstract) - f: Beth yw hynny/hynna?
"this" and "that" is difficult in Welsh for an English speaker, so ask if any of that's unclear.
The demonstratives are explained in the course notes for the section 'Money' - https://www.duolingo.com/skill/cy/Money/tips-and-notes
See this for finding the notes generally - https://forum.duolingo.com/comment/17638579
Some of the demonstratives can also be used as adjectives. For example:
- y car hwn - this car
- y ceir hynny - those cars
- y gadair hon - this chair
- y cadeiriau hyn - these chairs
But in colloquial Welsh it is very common to use 'ma and 'na for this/these and that/those.
- y car 'ma - this car
- y gadair 'na - that chair