Small business / extra cash

Hello ladies so my question is how can I start a small business to make extra money I’m a stay at home mom of 2 small children and I want to make some money .

My husband dose all the paying the bills etc I would like to have some cash of my own to buy Christmas gifts I feel weird using his money to buy him things .

Is there a way I can make extra money any websites I can join that are legit or even start a small business online any ideas what do u stay at home moms do to make side money ?

Other than the apps letgo and offer up (: