If you are intending to create more than 1 version of your mailing, working on the master version first will save you a lot of time. 

As well as general content, you can set important campaign level information (e.g. link tracking) in your master version so you only have to do it once. 

You can also set standard  design elements, standard links (such as unsubscribe or homepage links) and  data level personalisation (e.g. Dear %%First Name%%) which will then carry  through to all other versions. 

Even if you need different links for different  versions, you can often set the link structure just once in the master version.  

Useful Links:
What is a master version? | How Versions work together | Non Master Versions | What is inheritance? 

Did this answer your question?