Follow along with the video below to see how to install our site as a web app on your home screen.
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Here is the analogy I like to make.
Wordpress is a pre-fab double-wide house. It comes on two trucks and you "install" it on your empty lot and then customize it... paint, nice floors, maybe a deck, etc. You don't need many tools to do it. It also comes with all the plumbing and wiring built in so all you have to do is hook it up to the water line and the power line and that's that. It's going to look like other houses of the same type, but it will keeps the rain off your head!
Most of my sites use both. I like to put my questionnaires on a regular xHTML page, but even though I'm comfortable creating new pages, there is no easier, faster way to put up new content than creating a WP post.
I usually put WP on a subdomain. This has its disadvantages. Some of the plug-ins don't work or need to be updated manually when they are on subdomains.