Ask How do you set up a custom login page for a membership site?

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I want to create a custom login page for my membership site, but I don't know where to start. I want it to look professional and match my brand. I also need it to be secure and user-friendly. I've seen some sites with custom backgrounds, logos, and even social login options. I have no idea how to do that. Do I need a plugin, or is there a simple way to set it up? How do you set up a custom login page for a membership site?