You can choose to do manual testing or automated testing.
For cross browser testing, you can download a couple of Windows VMs and Linux VMs, and buy a Mac mini to make sure you cover all browsers (Chrome, Firefox, Safari, ...)
Or you can use one of the many cloud-based cross browser testing services out there, for example testingbot.com - it has versions of all Chrome, Firefox, Safari, IE and Edge browsers.
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You can choose to do manual testing or automated testing.
For cross browser testing, you can download a couple of Windows VMs and Linux VMs, and buy a Mac mini to make sure you cover all browsers (Chrome, Firefox, Safari, ...)
Or you can use one of the many cloud-based cross browser testing services out there, for example testingbot.com - it has versions of all Chrome, Firefox, Safari, IE and Edge browsers.