Is it safe to remove unused apps on iPhone or MacBook to free up space?

Also. just removing apps may not clear the space you need. Better to install external disk and copy extensive files such as photos or music files onto it so hey can then be erased from your HD to claim the needed disk space.

“removing unused apps: is removing apps i’m not using on my iPhone or macbook ok to save space?“

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Safely Deleting Apps:

Particular builtin apps cannot be deleted. So, you’d be stuck with those. As for third-party apps, you’d lose a license, and likely some files that are stored within the applications folder within your username.

So, Back Up your Mac, First:  Be certain you Create a Time Machine Backup of your Mac, so that way you can have something to restore your Mac from, should anything go wrong with the reconfiguration.