Screenshots pile up on your desktop as PNG files instead of going to the clipboard
Every time you take a screenshot with ⌘+Shift+3 or ⌘+Shift+4, a new PNG file gets dumped on your desktop. You just wanted to paste a quick screenshot into Slack or an email, not create a file. After a week your desktop looks like a screenshot graveyard.
Why does this happen?
macOS defaults to saving screenshots as files on the desktop, following a long-standing convention that predates the quick paste workflow most people want today. The clipboard option exists but isn't the default.
How to fix it
To copy to clipboard instead of saving: add Control to your shortcut — ⌃+⌘+Shift+3 or ⌃+⌘+Shift+4.
To change the default behavior: ⌘+Shift+5 → Options → check Clipboard to always copy instead of save.
You can also set a custom save folder so screenshots don't clutter your desktop.
Discussion
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