Differances between tax liens and notes

[John Clark]

Hi All,

Can I get some help with some with the major differences between a tax lien and a note?  Somethings like; cost to purchase, where and how to, basic differences? I have a general knowledge of them but not sure how to get start and witch one might would be better.  I know this is open but that's were I'm at.  Is the main reason to get into tax liens to foreclose and get the property? 

Thank you,

John