I had to deal with the same problem not long ago. Accepting payments online is rather simple in principle, you just need to find a method that matches your needs.
If you are looking to be paid for freelance work or other forms of services provided online, good old PayPal is likely to be the best option. It’s easy to set up, easy to send and receive cash on, and it allows you to receive payments across countries, time zones, and currencies. You’ll also have an easy time transferring your earnings to your bank account. PayPal is often the tool that sites offering paid online surveys, online surveys for money use to pay its users.
However, PayPal does have its limitations. The platform cannot be used to accept payment for illicit products (even if they happen to be legal in your region, they err on the side of safety), and there’s little anonymity on the platform. There are other platforms with more lenient terms of usage and more anonymity tools, but often people who are worried about privacy choose to be paid in the form of gift cards, since those can be sent out as a simple redeemable code, and there’s no way to trace who redeemed a gift card code. They are also relatively easier to use than cryptocurrencies.
Oh, and if you were interested in the online survey idea, here’s a list of legitimate survey sites.