well, for a start, organizers fight a fucking lot and there are a trillion splits every year, so yeah, you have to follow this shit to know what the fuck is going on at any moment
for example, this very year we had:
>Top Race Junior (Codasur (FIA)) turning into TC Junior (ACTC)
>ACTC being the regulatory body of Turismo Nacional instead of the APAC
>the creation of Turismo Carretera 2000 (TCRR2000) as a consequence of a split inside TC2000 (I don't see it a future, people didn't like it, btw ACTC and the Mazzacane family are the great satan here)

in argentina you have 4 main categories, as of this year 2025:

>Turismo Carretera (TC)
>Turismo Nacional (TN)
>Turismo Competición 2000 (TC2000)
>Top Race V6

>Turismo Carretera (TC)
the most popular by a mile, organized by the ACTC, these are heavily modified stock cars, here you have an ACTC path that goes like:
>TC
>TC Pista (feeder series to TC)
>TC Mouras (regional-level series)
>TC Pista Mouras (entry-level series)
>TC Junior (new training series)
AND parallel to that:
>TC Pick Up (feeder series to TC)
>TC Pista Pick Up

>Turismo Nacional (TN APAT)
these are barely modified stock cars produced in argentina and then in argentina and brazil, it's divided in two classes:
>Clase 3 (C-segment cars)
>Clase 2 (B-segment cars)
then you could say this other category is a feeder series but you can get confused because it's usually televised together with TC2000:
>Turismo Pista Clase 3
>Clase 2
>Clase1

>Turismo Competición 2000 (TC2000)
TC2000) / Super TC2000 (unified like 4 years ago under the TC2000 brand), organized by ACA (FIA), these are touring cars, here you only have
>TC2000