Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

My friend wants to put my name down for a house he's buying. What risks would I be taking?
The risk is that you will owe the bank the principal amount of the mortgage. Based on your question it would be foolish for you to sign. Anyone who describes a mortgage as "something" obviously has no idea what they are doing and should never sign a mortgage which is a promise to pay hundreds of thousands of dollars. You would be doubly foolish to sign the mortgage because if you are guaranteeing the loan, you own nothing. So, for example, if your friend sold the house, pocketed the money, then left the country you would owe the full amount of the mortgage. Since you are not on the deed there is no way you can prevent this from happening. He does not need your approval to sell the house. So, essentially what your "friend" is doing is asking you to assume all the risk of the mortgage with none of the benefits, since he gets the house, not you. If a "girlfriend" is involved, that just increases the risk you will have a problem. Also, although it is not clear, it appears this is a second house for him. If so, that disqualifies him from any mortgage assistance or relief, so the risk is even higher. Basically, it would foolish in the extreme to co-sign the loan.