

Keyboard shortcuts in general.
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Alt + left right (previous/next page in browsers)
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Windows + 1 (2, 3, …) on Windows and KDE focuses the window at that position in the taskbar
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Alt + Tab to switch windows (hold shift to go backwards)
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Windows + Tab to switch windows within the same application (like, all browser windows if you’re in a browser)
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Alt + 1 (2, 3, …) on Windows/Linux usually selects the corresponding tab
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Ctrl + Tab to cycle through tabs like Alt-Tab does for windows (hold shift to go backwards)
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In most browsers or things with a URL/go to bar, Ctrl+L will focus that. No need to click the address bar, Ctrl+L, example.com, Enter.
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In Discord and Slack, you can press Ctrl+K to open a box to quickly type a channel/DM name to go to it quickly
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If you have them, the Home/End/PageUp/PageDown keys are actually pretty useful. Press Home instead of scrolling all the way back up.
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F1 is usually help
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F2 is usually rename
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F3 is usually search
The email used to be used to send you notices if your cert wasn’t renewed and other communications. They’ve just discontinued that feature, so the email isn’t super important.
It’s a good idea to provide a valid email address, but it’s not that important and doesn’t really matter for the purpose of issuing a certificate. It’s not part of the problem you’re having.