The costliest property problems in India rarely come from the stamp duty rate. They come from what was skipped: a title not traced back far enough, a cash component that leaves the buyer with no proof, a sale made on a power of attorney, missed TDS that brings notices and interest, a broker agreement with no written terms, or a builder who delays possession with no clear route to compensation.
The guide to property transaction mistakes is the starting point and links to every guide here. You will also find how to complain to the state RERA authority about delays and refunds, why under-reported sale prices and cash payments are risky, how to check title and get an encumbrance certificate, the difference between an agreement for sale and a registered sale deed, and a directory of official central and state portals.
These guides are general information, not legal advice. For a high-value purchase, an inherited or disputed title, agricultural land, or a builder dispute, have the documents reviewed by an advocate who practises property law in that state.