面白かった Vs. 有名だった


So, I'm relatively new to Japanese and I'm learning. And I notice that some
words are paired with かった or だった, even though they're both for referencing
past. So, my question is: When is it appropriate to use かった and when do you
use だった? I'm sorry if this question is a completely rookie question. :v




The 連用形{れんようけい} ("connecting form") of an _-i_ adjective + verbal auxiliary た
which indicates the past tense is かった like in 面{おも}白{しろ}かった.

The 連用形{れんようけい} of a _-na_ adjective + verbal auxiliary た which indicates past
tense is だった like in 有名{ゆうめい}だった.

And The 連用形{れんようけい} of verbal auxiliary だ which means "is" (i.e. it marks the
predicate) + verbal auxiliary た which indicates the past tense is だった like in
前{まえ}はその場所{ばしょ}は川{かわ}だった ("In the past, that place was a river").

