There are just like the proverbial "thief that comes in the night". Inorder to catch the thief you need to stay awake all night.
Is it worth it? Yes in most cases if you ask me.
Some of this coins are directly and indirectly linked in a way. I have noticed that a rise or fall in one coin triggers a proportionate rise and fall in the other coins too. eg maidsafecoin and storjcoin x
study the marked area well.