Have you ever noticed how these software makers always include an array of rules of survival? Here's a tip, try to download Android Apps and get a free software with rules of survival. It's great for an idea. The software or Android Apps may be free but the fact that it is not free.
Why? Because the software is packed with ads which are a nice add-on but have a bigger influence on your wallet than the actual content of the application. Well, this is not true. There is a small subset of users who use the free apps and get annoyed by the ads. Then they download one of the paid applications and be shocked that it has a higher price. You can't argue with logic, after all it's the nature of business.
So what are you going to do? Download a free app with guide rules of survival. The free app is packed with all sorts of advertisements. If you download it, then your personal use for the application will be considerably affected because of the ads. Remember, Android Apps is great to have because you have a good control over your usage.