Transfer credits is a common term used in Universities and Colleges around the world. The basic idea of this is that credits, courses, classes or modules taken in an accredited tertiary institution is valid in another. That is to say that if one passed a course in "economics" to mention one example, and I decide to change Universities for a more prestigious, cheaper, a closer institution or whatever the reason could be, you should not have to take the same course again. 

Different Universities in different educational systems have diverse ways to look at transfer credits but generally it works within the following parameters.  

Transfer Parameters 

• Educational System
• Accreditation: This may be the must important part. make sure the institution you are in is an accredited institution. 
• Number of credits in a course
• Length of course
• Depth of course in comparison with curriculum
• Course content  

To have in mind

1. Make sure the institution you are attending is fully accredited to offer the program you are doing. 
2. Aways keep your course outlines. 
3. keep track of courses completed and grades. 
4. As much as possible keep your notes and researches. 
5. Keep your options open