software
To take a full screenshot, use the following command: Command + Shift + 3 To select a partial screenshot, use the following command: Command + Shift + 4 (highlight a section to take a partial screenshot after doing this keyboard command)
Command A = Select All
Key tip
Key tip
key tip
Key tip
To select all photos in Lightroom, you can press CtrlA (Windows) or CommandA (Mac) on your keyboard. This will highlight all the photos in your library.
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The same way you do on Windows. You drag your cursor to the start point, click, and drag it to the end point. If you want to highlight/select all, simply press Command+A.
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That may vary from one program to another. It may also vary according to the language. Often it is Ctrl-A, but for a specific program (and language), just look for the "Select All" command in the menu - the shortcut key is usually displayed next to the command.