1. Selecting words.... Hmmm not that i know off, if the text is from a document, i use adobe pdf reader to copy it. Its the easiest. If the text is from a text entry box, touch where u wana start then long press for options.
2. Cycle open apps. There are a few task managers out there and maybe one has shortcut keys, i am happy with the default one, like 2 windows on top right corner, bottom right is ur application list key. O and holding the home key opens ur 8 recent appz.
3. Go t play store n try to update gmail. Or go to settings, accounts n disable auto sync
4. Tasker is like an app that causes things to happen under certain situations. Like, if mapz app open, enable gps. Or if i leave home, switch off wifi, or at 8am switch to silent till 5 pm. The list is endless, google for more