As for me my password is consist of 14 characters with upper letters, numbers and special characters, and its the same password i use on my social media accounts and exchange.
That is not a great idea to use the same passwords on different resources for a number of reasons. There are two types of brute force attacks in which hackers may use your laziness against you and get access to all the websites on which you put the same password. One of them is called "Reverse brute force attack" when hackers take your leaked password and start searching through many of usernames in order to find a interrelation. The second one is called "Credential stuffing" when hackers trying your login+password combination whereever it is possible in order to access your accounts. If you reused your credentials, you most probably will find yourself hacked.
Regarding the strong passwords containing upper, lower letters, special characters and numbers... It doesn't matter how strong password is if the input method you are using to insert a password is not safe. You can't memorize such a long password (you shouldn't), but be careful when using a keyboard to type it manually or when copypasting, your password may be easily intercepted.