Yes, we can buy books from the library to nexus 7. Simply go to the play store and shop for the books you like.
Simply search for Google Play Books, and you will be able to re-download the app. This goes the same with the Amazon Kindle app.
Yes, Buy them in the Play Store and download them with the Google Play books app.
No, you will have to download a movie to a Nexus 7 tablet on your own.
This varies on which ebook app you have installed, but most allow for syncing from one device to another. However, if you have deleted a book or more, you would have to re-download that book for it to appear in your library.
Yes, but only if you download Skype
If you do not like the keyboard choices that came with the Nexus 7, you can download third-party apps such as SwiftKey, Swype, Emoji, and others.
Move the files from the SD card to a computer. Then connect your device to the computer via USB cable and move them to the Nexus 7.
There's currently no iTunes app for the Nexus 7, or for Android OS in general. However, there are various syncing apps where you can sync downloaded content from iTunes to any Android-powered device, which includes the Nexus 7.
You can download it through the Google Play Store.
Yes, you can download games from the Google Play Store.
Downloaded files typically save into a Download folder on your Nexus 7. You can access your downloaded content with the Downloads app, which is pre-installed in your app drawer.
From what I see, it seems to be only available for Samsung tablets and only in the Samsung website. However, since it requires Android OS 2.2 or newer, theoretically it should be able to work on any tablet with Android, including the Nexus 7. What you could do is try to download the app with the Nexus 7, assuming of course it will let you download it with a non-Samsung device.