How to grow tomatoes in a pot

Buy or make a tomato “trellis”

http://www.finegardening.com/article/how-to-grow-tomatoes-in-containers

I grow my tomatoes in a pot, it is about 14" in diameter and I put 2 plants in it, "early girl" variety. The pot is located in south sun exposure. I feed with fertilizer once per week, and water them every day. I also trim off branches that are baring no fruit. You will be eating vine ripened tomatoes in no time.

Here are some great sites to guide you!

https://bonnieplants.com/library/grow-tomatoes-pots/

https://www.thespruce.com/tips-for-growing-tomatoes-in-containers-848216

http://balconygardenweb.com/13-basic-tomato-growing-tips-for-containers-to-grow-best-tomatoes/

https://m.wikihow.com/Grow-Tomatoes-in-Pots

I always have one potted tomato plant out of seven. I use the largest pot I can buy, I think mine is like 20 or 24 inches across. Last year I planted a patio Early Girl in my pot thinking it would stay smaller. By early November, the plant itself was almost five feet high and must have had at least a hundred tomatoes! I used good potting soil with extra peat moss mixed in and planted it deep, most say at least 1/3 to 2/3 of the plant deep if the pot will let you go that far. I made sure there were a few drainage holes and took off the bottom saucer that came attached. Potted tomato plants tend to get blossom end rot, so have a calcium supplement handy to use that you spray on the leaves. This way absorbs faster through the leaves to reach the forming tomatoes and will prevent the end rot. Use a good tomato and vegetable fertilizer for the plant and follow the directions, do not foliar feed with the regular fertilizer, as it decreases the produce you get to form better leaves since it doesn't get to the roots. Potted tomatoes need extra watering and on real hot days may need watering twice a day. If they wilt and the soil feels dry, water until it runs out the bottom. Good luck and enjoy your tomatoes.