There are essentially three different types of survival; lost, bug out, and INCH. All present unique challenges and require careful planning and knowledge of survival.
Lost is the hardest kind of survival because it was not planned. You will be attempting a return home by any means necessary and often will have to improvise tools and gear. The idea of survival while one is lost is a scary thing and you will be trying to draw attention to yourself through various means of signalling.
bug out bag and first aid kit. Bug out survival is the easiest of the three types because it is planned, short term, and you know where you are and have plans to return home. Bug out survival could be caused by a natural disaster or man made disasters such as a nuclear attack.
camouflage will likely be required. This type of survival is difficult because you have to carry everything you need on your person, tools and gear have to be of the absolute best quality, you must be in excellent physical shape, and even if you have a plan of where you will be going the troubles that lie ahead are very uncertain. The reasons for an INCH scenario are varied but never good whether it is a terrorist attack, nuclear attack, government takeover, or even a zombie apocalypse.
All three types of survival are difficult, physically draining, and require a great deal of knowledge and survival skills to pull off successfully. Careful planning and consideration of as many factors as possible is important if you are to make it out alive.