The million-dollar question: why hasn't Apple made a PDF editor available as a fallback app on new MacBooks?
If you don't have a third-party editor installed on your computer, then editing and modifying PDFs is a recurring exercise in torture. The act of manually editing a doc often unfolds as such: convert PDF into Word doc, do editing, take a water break, fix messed-up formatting, eat a cookie, initiate file conversion back into PDF, read Avengers: Endgame plot theories, yell at frozen conversion screen, cry a little...
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from Mashable https://mashable.com/shopping/deal-april-20-pdf-editing-app-mac/