Question: In my dictionary there's both "sana" and "saniga" for "healthy". What is the difference? Can I simply always use "sana"? If not, why?

Answer: 
* sano = health
* sana = healthy
* saniga = describes a noun, which makes someone or something healthy
* sanigi = to make someone or something healthy
* saniĝi = to become healthy
Ankaux, jen eksemplo de la diferenco.

La vundo sanigxas- The wound heals.

La kuracisto sanigas la vunditon- The doctor heals the wounded person.