Magento includes several payment methods by default:
PayPal
Braintree
Check or money order
Bank transfer payment
Cash on delivery payment
Zero subtotal checkout
Purchase order
Authorize.net direct post
You can see the configuration for those payment methods on the System Configuration page (STORES | Configuration) in the SALES | Payment Methods section:
Here, you can see that Magento recommends the following payment solutions:
PayPal Express Checkout
Braintree
However, in the Recommended Solutions section, you will see that there is a link located in the bottom-right corner--Other PayPal Payment Solutions. If you click on that link, you will see the other PayPal solutions that are included in Magento:
This makes a total of 13 payment solutions that are included in Magento out-of-the-box, which gives you a lot of alternatives to set up the payment methods that you prefer.