( 1) Never give personal details like mobile number and other contact details publically.
( 2) Choose big brand sites like JeevanSathi , Shaadi.com, these are some big brands which work for you and verify the opposite party for you for marriage purpose and charge you according to services you take from them.
And dateing sites like tinder, Truly Madly, DilMil, Bumble, Mingle2 are there but according to me there are only fake profiles mostly. Here majority of people make accounts to have fun, they are not serious for dating someone for long terms.
( 3) Don’t give your true details on online dating sites as it can be misused and spammed.
( 4) If you’re meeting someone personally through this site, try to meet at public place.
( 5) Never trust the person fully through here and before verifying personally and meeting that person for only for 1-2 time.