Q.Jade plant water
For a Jade plant, should you use a saucer under the pot to hold water? The outside saucer under the pot is holding water. Will this cause over watering?

If you are seeing water in the saucer under a pot this is a good indication that your plant is being over-watered. You can further verify this by touching the top of the soil to see if it's damp/soggy. You will want to empty that saucer of the water. If the plant pot sits in that saucer for too long it could cause root rot.
For more information on the care of jade plants, please visit the following link:
https://www.gardeningknowhow.com/houseplants/jade-plant/jade-plant-care.htm