As a first step to qualify you must have at least 40 Social Security credits.
Can you earn Security credits by paying taxes?
When you work and pay taxes you choose to earn credits that can be used.
How many credits do you need for retirement benefits?
It depends on some factors.
Can you explain more about it?
Sure, you need 40 credits to qualify for retirement.
Does the amount of credits affect the amount of benefits you receive?
It does not affect it but it is important to determine if you are eligible or not.
Can this vary each year?