What are the main properties of covalent compounds?
Here is a short list of the main properties of covalent compounds:
Most covalent compounds have relatively low melting points and boiling points
Covalent compounds usually have lower enthalpies of fusion and vaporization than ionic compounds.
Covalent compounds tend to be more flammable than ionic compounds.
When dissolved in water, they don't conduct electricity.
Maybe you'll be interested in comparison of properties of ionic and covalent compound so here is a link where you can learn it.