If I ask, how do you remember your Salesforce instance username and password? Possible answer could be
- Writing it in Excel sheet or some other place like Evernote or Onenote
- Remembering it
- Using some extensions like LastPass, Force.com Logins or Salesforce.com Quick Login as
However all above techniques have vulnerability of password leakage.
Salesforce offers a product free of cost to solve this problem and known as “Environment Hub“.