Your Croton is already struggling from the repotting. Two of the stems have lost their leaves and probably will not recover. Crotons do best on a cool sunny windowsill. They also don't like their roots disturbed. The repotting has also made proper watering more difficult. In general, the soil around the roots should stay damp.
Your Sansevieria also would have been better left in its tight nursery pot. The soil needs to dry deep (halfway) into the pot before watering it lightly. It can withstand drought, but not constanly damp soil. It can tolerate low light as well as a sunny location.
Your Dracaena fragrans is commonly called Corn Plant. It is not a Dumb Cane which is a Dieffenbachia species. The Dieffenbachia is toxic but the Dracaena is not.
Your Corn Plant also would have been better left in its nursery pot. It should be close to a window but beyond the reach of the direct rays of the sun. Allow the top 2 inches of soil to dry before adding just enough water so that the top 2 inches get dry again in about a week.
Every plant is unique in its requirements so a one-size-fits-all approach is not a good idea. If you have care questions about specific plants, this site is the best place to get reliable information
