Solution: If you already have a salesforce developer or production account, then
use the below url to login to salesforce
Login to Salesforce (https://login.salesforce.com/)
Enter the username and password and click on login button to login to salesforce.
Note: If you enabled MFA,it will ask for security code to enter or approve notification to proceed.
If you want to login to a salesforce sandbox instance then
use the below url
https://test.salesforce.com/
Next steps will be same as above.
If you want to create a new salesforce developer org to learn or practice, go through the link below
