Q.broken tomato plant
We’ve had a lot of wind in the last couple of days, and when I went out to evaluate the damage yesterday evening, I discovered a fallen tomato plant. Its main stalk is about halfway snapped (feel free to skip the lectures on caging–lesson learned!) but is attached enough that the plant continues to flower and will presumably set fruit. My question is this: should I leave it alone completely, stake it but otherwise leave it alone, or cut the plant and try re-rooting from the stalk?

This type of break or bend is quite easy to repair and generally has good results.
It can even happen with a cage, so no lecture!
You may need the help of another set of hands. Gently straighten the stem up and place a splint of a craft bamboo or even thin bamboo sticks.
Wrap this area of the plant with grafting tape to secure the splints.
Stake the plant to help secure the plant from further damage. As the plant grows you may need to loosen the splints.
If the top part begins to wilt, the splint did not work. You can then cut this part off.
https://www.gardeningknowhow.com/garden-how-to/info/reattaching-broken-stems.htm

All you have to do is replant the broken end in the soil. Tomatoes can grow roots all along their stem, so if you replant the broken end and give it some extra water and care for the next 10 days or so. It should be good to go. Don't forget to stake or cage the tomato after you've replanted it! You can find more gardening advice on my blog http://www.bluegardenfairy.blogspot.com And for more information about rerooting tomatoes visit http://homeguides.sfgate.com/can-regrow-tomato-plant-snaps-half-59933.html