What is the rate of STT on buying shares?

Excuse me, could you please clarify for me the exact rate of STT, or Securities Transaction Tax, that applies when one is purchasing shares in the current market? I understand that this tax varies depending on several factors, such as the type of shares being purchased and the value of the transaction, but I'm looking for a general understanding of the standard rate. Additionally, is there any specific threshold or exemption that applies to STT on share purchases? Your insight would be greatly appreciated.