RE: how can you take snapshot/screen shots in case of manual testing and how can you attach it to the test case?
For taking Snapshot/Screen shot you can use Print screen button and paste it in Paint and save as .jpeg file. If you are using application for writing test cases you can attach the picture file to the test cases. If you are usinf Excel for writing test cases you can paste the picture by using Insert-Picture (insert from File). One thing why you want to attach Snapshot/Screen shot for Test Case.