All the people involved in internet marketing, or even provide the registration details for anything that requires the provision of a username and password, will eventually need some way of remembering them.
Security is another issue that people have to think about, but their main problem is to remember the password. It is not so much a problem when you start out in internet marketing and only has a dozen or so to remember. You can test the strength of your password with a password management tool.
However, once you are established and registered with a large number of newsletters, membership sites and other sites that require passwords and login details, then you will have to remember them all.
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If you engage in article marketing, you must register with each directory, and unless you use the same password for all of them, you will have many details to remember. Internet banking and credit card management should primarily be safe and need more details for you to remember than is normally required.
There are a number of ways in which you can do this. The obvious way is to put them all into an excel file and provide password protection, and this is what many people do.
There are many password management tools in the market. You can use these tools to secure and remember your passwords. It will be worth it for you to get one.