Something like eye colour has very high heritability (>80%), which means it’s almost completely determined by genetics. Something like a person’s first language has 0% heritability - as that’s entirely to do with their environment.

What it doesn’t mean is how likely something is to be inherited from a parent , as even if a condition had 100% heritability, and so was completely down to genetics, it might be associated with a dominant or recessive gene, or more likely associated with many many genes, which interact in complex ways and which are still being explored & discovered!