How do you show proof of income for a visa application?

here got it from https://twomonkeystravelgroup.com/show-money-visa-application-filipino/
https://blog.iefa.org/2021/07/15/proof-of-funds-for-your-f-1-visa/
https://www.alllaw.com/articles/nolo/us-immigration/i-134-affidavit-support-instructions-tips-sponsors.html

To prove source of income for visa application, you need to
Provide original tax returns from the last three years (Form 16)
Provide bank records and/or fixed deposit statements of your sponsor for the last three years
Provide pay slips, employment letters, and/or business documents if you are employed or self-employed
Be honest and consistent about your income and assets
Have enough funds to cover your daily travel expenses