it is difficult to crack the password in which there are CAPITAL LETTERS, small letters and numbers (not the date of birth!),
not from the dictionary, that is not a word, not a name ...
A separate password for each individual service.
Not associated with you (address., Cellular number ...).
If you have to register a lot, why not make a group of passwords, ex. One password for all forums where you register because there is nothing to steal (unless you are a famous person, except that friends make fun of it).
Insiders
Insiders are people who have direct access to your data, for example employees of Mail.ru, where your mail is located or Odnoclassniki sites, VK. An unscrupulous employee can simply take your password.
Therefore, we do not use questionable services. The sale of passwords was corrupted by Mail.ru.
Trusted services are Google, Yandex.
For ease of remembering password, people use the same password for everything.
It is recommended to have a unique password: for e-mail and payment systems.
The remaining passwords can be grouped. For example:
Simple password and login for registration in all temporary and non-important places. For example, we want to download something on this site, and we are required to register. Chance is not enough that we generally go there, there is nothing to protect us, therefore we write something simple and unique (that was free). For example. Login sim-sim password open.
A strong password for all forums and social networks, etc.
Because, no matter how complicated your password is - we do not make one password for everything !!!
The most complex and secure password
This is your e-mail password. If you access your mail, you can access all the places where you registered. Therefore, this password must be reliable.
Store passwords conveniently in special programs - Password Managers.