How do I add dollars to Steam?

Can you walk me through the process of adding dollars to my Steam account? I'm a bit unsure of the steps and would appreciate a clear, step-by-step guide. Specifically, I'm wondering if I can use my credit card, debit card, or even a cryptocurrency like Bitcoin to fund my Steam wallet. And if so, how do I go about doing that? Additionally, are there any fees associated with adding funds to Steam, and if so, how much can I expect to pay? I'd also like to know if there's a limit to how much I can add to my Steam wallet at one time. Thanks in advance for your help!