To add a widget, go to the homescreen and press the Apps icon (the circle with 6 dots). Then you will see a list of your Apps with the word Apps and Widgets at the top. Press Widgets, then you will be presented with a list of available widgets.
To add a widget, press and hold on it and then position it where you want.
To share or upload a video to services like Facebook or Youtube, start from your Gallery App and long press on a video.
From here you will be given options to share the video with various services.
To disable / enable vibrate (also called haptic feedback) when you type or press the screen, go to Settings - Language & input - Settings.
Then uncheck Vibrate on keypress.
At the bottom of each homescreen is your favourites tray, which consists of 5 icons. You can customise it by adding icons to the tray. If it's full however, you will first need to remove some.
To remove an icon, simply press and hold an icon. Then drag it to your desktop.
Then to add a new one, simply drag an icon from your homescreen to the favourites tray.
To silence the phone when ringing there are two methods:
Either press the Volume Down (or Up) button or if the phone is on a surface facing up, simply flip it over so it is facing down.
There are two options to increase the font size on your phone:
The first is to simply install a new font that is larger than the default font. Font Changer and Type Fresh are two Apps that allow you to change Fonts on your phone (they do require Root access though).
The second option is to use dedicate Apps to change the font size, although they will normally only work for SMS and some Google Apps.
To enlarge the SMS font, go to the Android Market and download an App called ChompSMS. Among other things, the App allows you to increase the font size of your SMS messages.
For enlarge SMS and the standard Google Apps fonts, then download an App called SMS/Talk Text Enlarger.
If you want to type non-English letters (eg those with an accent), long-press on the relevant letter. A list of options will appear for you to select.
Open your music and play a song. Then press Menu - Sound Effects. You will then be presented with an equalizer including presets.
If you want to browse in full screen mode, without the URL bar at the top of the browser, then you can enable this..
Open the standard browser and press Menu - Settings - Labs. Then put a check mark under Full Screen .
To get access to the browser options (that are now invisible), there is now a neat hidden menu. Slide your finger in from the left or right of the screen. A circular menu will appear with various options.
To change your default font, you need to download a third-party app because Android does not have a built-in way of changing fonts
There are two good Apps that allow you to change fonts:
Font Changer - There is a free version and a paid version. The paid version allows you to change the screen density and allows you to preview the font. You can also change a few other options.
Type Fresh - With this App you can load any TrueType font and also backup your default fonts to your SDCard. Be aware that you might need to reboot your phone after installing Type Fresh.
Also, if you use GoLauncher, then try downloading GoLauncher Fonts.
Note: most, if not all, font changing Apps require you to Root your device