Q.tomato plant leaves are turning brown
The outer edges of my tomato plant leaves are turning brown. What could be the cause and how do I fix it? The tomato plant at first was a potted plant that I recently replanted into the soil and tied it to the stake. Ever since the replanting, the leaves have began to turn brown around the edges. The stock even has some brown areas. The plant is producing fruiting flowers and even has 6 baby green tomatoes. This is my first experience with a garden; please help!

I would inspect your tomatoes for early blight, which affects the leaves, stem and fruit. Here are links to aid you in your identification:
Early blight leaf examples:
http://blog.tcgardens.com/wp-content/uploads/2014/08/Tomato-Early-Blight-Leaf-Examples-Cornell-University.jpg
Early blight stem examples:
http://www.maine.gov/dacf/php/gotpests/diseases/images/early-blight-stem-big.jpg
Article on early blight:
https://www.gardeningknowhow.com/edible/vegetables/tomato/early-blight-alternaria-tomato-leaf-spots-yellow-leaves.htm