All sorts of handy tips about the Mac - Catalina Edition 2020 (PDF download)
This is such a handy guide, giving your all sorts of tips like : how to screen shot, using the Preview for so many things, printing and PDFS, hidden keys (such as currency symbols, letters with accents), keyboard shortcuts, lots of useful built-in apps, great apps to get from the App Store, and more. Here's the table of contents for this latest, macOS Catalina edition.
BEFORE WE START
About this guide
Click, Double-click and Right-Click
TAKING SCREEN IMAGES (SCREEN CAPTURE)
Keyboard Shortcuts to Capture your Screen
New Options for Screenshots
Screen Capture Menu
TAKING A PHOTO ON YOUR IPHONE (OR IPAD) – DIRECT TO YOUR MAC!
QUICKLY TIDYING A MESSY DESKTOP
CREATING A PDF FROM ANY IMAGE/S OR DOCUMENT
THE PREVIEW APP VIEWING & EDITING IMAGES/PDFS
Reduce a PDF file size
Change the size of an image
Merge multiple PDFs into one PDF
Merge multiple images into a single PDF file
Rotating pages & images
Create a PDF or image from the Clipboard
Draw and write on a PDF
Crop a PDF page or image
Other forms of cropping
Cropping the selected area instead of the surrounds
Remove a background
Quickly view any PDF or image with Quick Look
Make Preview the default app for PDFs and Images
HIDDEN KEYS ON THE KEYBOARD
SYMBOLS AND EMOJI
OTHER USEFUL BUILT-IN APPS
Digital Colour Meter
SOME APPS WORTH ADDING
DropBox, OneDrive, Google Drive
Malwarebytes for Mac
FIXING A SLOW MAC
Why is my Mac so slow?
How many apps and web pages are running right now?
When did you last do a Restart
Could it just be a very slow internet connection causing your issues?
Are there multiple ‘Users’ logged in?
Too many login or ‘start-up’ items
Quit apps when shutting down & re-starting
Is your Mac running low on disk space?
Check your Hard Drive’s health
Too much on the Desktop
Do you have Adware/Malware
Is there some process ‘spinning out of control’