There may be an element of truth in these. Most are completely nonsensical and contradict one another. Many cat superstitions developed because of the supposed link between witches and cats. However there is intense and widespread feeling that cats have some kind of supernatural influence. Luck Cats bring good luck.
Cats bring bad luck.
If a cat crosses the street it is a sign of bad luck. If a black cat crosses your path you will have good luck. It is lucky to own a black cat, but unlucky to meet one. It is good luck to sleep with a cat. If a sailor's wife keeps a cat it will ensure her husband's safe return.