[orgkim98]

Hello, everyone. I have been having problems with chiral carbons and stereoisomers. I know what it theoretically means but I sometimes cannot do the part where we turn our molecule so that lowest priority group projects away from us. I generally choose a group as my axis to turn my molecule around itself and go for it. However sometimes it works and sometimes it does not. I don't even have a slightest idea why such a thing happens. 
Could you please help me why this happens? Do you have your own method of imagining it?
Thank you in advance.

[Dan]

Can you give an example of one you got wrong? If you show us what you're doing (draw) we should be able to see where you're going wrong.