Just a quick tip how to keep your tomato plants healthy and have more tomatoes!
Remove those suckers!
They are called suckers because they suck the precious energy the plant needs to put into the actual tomatoes fruit. You need to pinch or cut them off as soon as you see one.
What are they? Look at the picture below - do you see the extra small branch that is starting to develop between the stem and the original branch? That's the sucker.
Sometimes I catch them very tiny and that is a bonus - the sooner you get rid of them, the better for your plant. It can focus on the important job. Also if you leave them, your plant becomes an uncontrollable bush and you have difficult time getting to your crop.