Place your terrarium in a bright space that receives indirect sunlight. Avoid intense, directly sunlight as this can cause temperatures within your terrarium to increase significantly.
Being a miniature ecosystem, terrariums require minimal watering. The soil within should be moist at all times but not soggy. If the soil appears to be dry add a small amount of water using a spray bottle.
When your terrarium has reached a healthy balance within your home condensation should form at the top of the glass jar in the morning and condense at night, returning to the soil below. If condensation is forming across the entirety of the inside of the glass jar, or there appears to be mold forming, there may be too much water present. To correct this, remove the top of your terrarium for ~5 hours once per week until condensation only forms towards the top.