When sprouting seeds or rooting clones it's a good idea keep them in a place with warm and humid air(~20-25°C / 68-77 °F). This is where a humidity dome comes in. Putting the seeds or clones in a Jiffy pot or a Rockwool cube and then filling bottom with water will create a humid climate perfect for germination and seed growth.
Happy growing! here I am starting tomato seeds, pepper, Chinese veggies and sugarsnap peas in plastic cups that can be reused for new seeds after replanting. Holes can be cut with the exacto in the dome for a little ventilation if needed. Don't forget to vote for your favorite entry in the green contest: https://www.instructables.com/contest/greendesign/