fav way to make money?

Yard sale. :p

I love doing this for sims that work from home and I never sell things form their inventory, so I always have them sell things they find or make. One of the most useful items from City Living and Jungle Adventure. Had a sim have a bake sale and just sale plates of cookies and brownies. Not overly lucrative, but enough to help a sim that's a stay at home parent to make an 'okay' living.