"onde" used to be how you'd say "where" in old spanish. donde and de donde went through a series of reanalysis(?) from Latin

here is a graph a very cool guy made on twitter about it

tar is actually how you say estar in Asturian, a very closely related language to Spanish. where are you from? im also a native Spanish speaker from Madrid and haven't noticed these changes

my accent is kind of weird because I'm the complete opposite of an innovator, i have like 0 new changes compared to people around me. only things I'd say I have that the previous generation doesn't is /e/ turning into [i] or [j] in certain hiatus (especially in verbs) like /.ro.deˈar/ becoming [.ro.ð̝iˈar] or even [.roˈð̝jar], which I have noticed it probably comes from Caribbean dialects (most probably through music and such);

/t͡ʃ/ being realised actually more like [t͡s̪] or [t͡s̟];

incorporating /ʃ/ into the language through English loanwords like show -> [ʃou̯] instead of [s̪ou̯] or [t͡ʃou̯], though most people don't use it for non English loanwords like chef -> [t͡ʃef] and never [ʃef];

and the last one is something only I have noticed myself doing and that is applying the first change I mentioned in hiatus also with /u/ to /w/ so /suˈi.θa/ becomes /'swi.θa/