The movie does not go in full details to what are the Skrulls powers, but here we have a full explanation on the wiki:
Skrulls are green-skinned reptilian humanoids with large pointed ears, red or green eyes, and chins with several vertical folds in the skin below their mouths. The males are mostly bald, while the females have full black hair. Skrulls are known for genetic and molecular instability, and genetic diversity, due to Celestial experimentation creating the Skrull "Deviants". The Skrulls are known for their physical malleability and ability to shapeshift to any size, shape, or color at will, taking on the appearance but not the characteristics of other beings and objects. Skrulls are able to assume virtually any form, be it organic (e.g., cows ) or inorganic (e.g., lamp ). As a result, the Skrulls excel at spying and infiltration. Skrulls are also able to use their shapeshifting abilities to form weapons (e.g., blades and clubs) with parts of their bodies, making them dangerous hand-to-hand combatants. Their sexual dimorphism is roughly the same of a human being, but their sexual orientation is more complex since they can change their genders at will.