You are trying to install or open an app that didn't come from the Mac App Store but you got a message saying App can't be opened because it is from an unidentified developer. This is how you bypass it.
If you don't want others to use your photos and images without your permission, you can create a so called custom watermark with your name or any other text you want.
Sometimes when you are writing a title, one last word jumps into the next row. If you don't want to change the font size, there is another way to deal with these so called widow words.
You will learn how to install a Google Analytics plug-in to your Wordpress site and connect it to a Google Analytics account, so you can start tracking your web traffic.