Generally you will find Ubuntu looks and feels very similar to Windows. Some of the main changes you should look out for are as follows:
Pressing the Windows + D buttons will no longer minimize your windows and show you your desktop. However, you can do this by clicking on the square logo in the bottom-left corner of the screen.
When a program experiences a problem, the relevant window will turn grey. If this happens, you should leave it alone and not click on it any further: it will usually rectify the problem in a few seconds and return to full color. This system helps avoid the Windows problem of a program freezing up and the user clicking on it repeatedly to try to get a response but only making things worse.
The Add/Remove function, found in the Applications Window, works similar to that in the Windows Control Panel. However, it also allows you to add new software from a large directory of programs. This will greatly reduce the number of times you need to download a program from a website and then install it.
If a program is not playing sounds, check that you have closed any other programs which play audio as this can cause conflicts.
If you transfer files to a removable storage device such as a USB stick, you must select the “Unmount” option in the file browser before removing it, otherwise your files will not be copied across.