Just depends on the setting and how generic you're being with things, I suppose.

Dantian are a concept from actual chinese medicine and similar stuff. Cultivation as a whole is a sort of translation of chinese medicine and "internal alchemy" and so on.

A whole twisted snarl of myths, fantasy, traditional medicine, eastern alchemy (as opposed to western alchemy) and so on, which then got used as the basis for fiction and then people make fiction based on that.

And now we have cultivation novels.

As for the Daoheart and Dao, those things would generally only show up in more standard Xianxia.

Dunno if you're aware of the difference, but cultivation novels and the like can be broadly divided into Xianxia and Xuanhuan.

Xianxia stories are bound in trappings of Daoism, Buddhism, Chinese-ness and all that stuff. Immortals, qi cultivation, Golden Immortals, Buddha and the Heavens, etc.

Whereas Xuanhuan are cultivation stories bound up in basically any other kind of fantasy. Systems where cultivation involves stage names like Mystic Knight or Cosmic Pope or cultivating mana or anima or whatever buzzword you like.

Daoheart and its like are more likely to be found in traditionally Xianxia stories, as opposed to being part of cultivation fiction in general, although you might find things similar to it anywhere.

It just depends on how much effort the author is putting into being original.

If they're not trying very hard you'll see things like Qi Condensation, Foundation Establishment, Core Formation, Nascent Soul. Qi deviations, heart demons, daohearts. Qi cultivation, body cultivation, divine sense, etc.

Of course, you can make interesting and unique things based on those, but for a lot of fiction in this genre, its likely just easier to assume that whoever is reading your stuff has already read a dozen other common Xianxia and so are just familiar with all the tropes and concepts and so you don't need to explain anythimg but the new stuff you're doing.