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Can I get inline help with functionality in my Android device? For example, my good old Nokia had a help feature, with which after selecting an item for a few seconds, it used to display the description and purpose of the selected item.
If this is not possible, where can I find a Jelly Bean user manual or documentation?
When you first activate an Android phone, there is a short tutorial that walks you through the home screen, adding icons/widgets to the home screen, navigating the home screen, etc. On stock android, there is also a helpful widget on the homescreen.
For many phones, there is a small booklet (often called the manual) in the box when you purchase the device. These booklets can also be found online, for example some popular Android 4.0 devices: Galaxy Nexus user guide, or Galaxy S3, or HTC Incredible. You can find manuals for your device by browsing the manufacturer's website or googling for "(device name) manual" or "(device name) user guide".
Manufacturer websites also typically have a Knowledge Base, Support Center, etc. For instance, HTC Support Center for Desire X or Samsung Support for Galaxy Note.
Finally, there are also Android StackExchange and other Android-related forums which contain lots of helpful people willing to answer your questions. If you're still unclear on anything specific, ask away!
Google Support offers some online guides. At present, the devices listed under Jelly Bean are:
Here's the Nexus 7 user guide in PDF format. Since it was the first device to launch with Jelly Bean and isn't hampered by manufacturer/carrier customizations, it's as close to a pure Jelly Bean user guide as there is.
There is always the Complete Android Guide, a PDF/wiki/book created by long-time Lifehacker editor Kevin Purdy.
