Just wondering hows property investment works.

Is it work same as buy n sell car?

For example,

If i'm buying a new property rm300k. approved loan for 90% loan 30years with 2% blr. so it makes total property amounting to rm432k.

If lets say property increase by 30% after a year.. and makes it rm390k. I still can't be able to sell it cos after deducting the loan amount, I still owe bank right.

Usually how property investment works? Cos from what I see, people tend to put down a booking fees for example rm3k. Loan approved, but don't want to sign S&P.. but whenever all units sold out, and prices increases, then they sell it and earn the difference??

Sorry, cos I'm quite confuse how it works. Or am I wrong on the basic of property investment??