Official modding site?

[Souptime]

So i've seen curseforge and spacedock, is there any official mod hosting site cause spacedock ALSO has a balsa flight sim page (A game made by HarvestR, creator of KSP) and it seems that curse if the official hosting site but i just wanna make sure

[Superfluous J]

Curse is the Official mod hosting site.

Spacedock is the good mod hosting site.

CKAN is the easiest way to find and track mods.

I personally use the forums to find and track mods.

[Vanamonde]

Yes, Curse is Squad's official mod hosting partner. 

[Gargamel]

The official hosting site is only official because SQUAD said it is.  Modders are not (usually) part of SQUAD, and are not obligated to use Curse.  Spacedock has been the favored hosting site for the last few years, there have been others before it.  But not all modders use curse or spacedock, some only host their mods on github, some use other websites entirely.   It's completely up to the mod author.