To make a sukkah kosher, there are several guidelines and requirements that must be followed. Here are some of the key rules:

• Walls: A kosher sukkah must have at least three walls, and each wall must have a minimum length of 28 inches (7 tefachim x 7 tefachim). The walls of the sukkah must extend at least 40 inches high, and the walls may not be suspended more than 9 inches above the ground.

• Roof: The roof of the sukkah must be made of vegetation, known as sechach, and must be open enough to see the stars at night. The sechach must be placed directly on top of the walls of the sukkah and cannot be supported by anything other than the walls themselves.

• Location: The sukkah must be built under the open sky, rather than under a tree or in a larger room. It should be placed outside, and you can’t build it under anything that will block the sky from above the sukkah. There should not be any trees or structures that will hang above the sukkah when you’re deciding where to build it.

• Size: The sukkah should be made sturdy enough to survive normal weather conditions in whatever climate the sukkah is built. It should be at least big enough to fit one person inside, although most sukkahs are significantly larger than that.

• Eating: All meals that involve bread or mezonos must be eaten in the sukkah. However, if one is only eating fruits and vegetables, or less than a k’beitza (volume of an egg) of mezonos then a sukkah is not required.

These are some of the basic rules that must be followed in order for the sukkah to be considered kosher. While there is some variation allowed, it is important to ensure that the sukkah meets the standards of Jewish law.