Start with a new jade plant. They are succulents and don't need much water. Only water when the soil is starting to go dry, and make sure the pot drains freely and is not standing in water. Give it some fertilizer during the growing season, not too much. They like a lot of sun, so a south-facing window is ideal.

I have a jade plant that is surviving but never really grows, has some leaves that are yellow but full, others that are withered and green. Watering is clearly the issue, but I have no idea if it’s too much or too little.