Best way to buy US stocks?

Unless you have reasonable capital in hand (>1.5-2L) which you want to invest, the overhead of buying the stocks directly will outweigh the returns being generated in the short to medium term.

If you want to go ahead and buy, will recommend using Interactive Brokers in place of INDMoney/Vested, since the interface is more detailed, supports every single feature which INDMoney or Vested supports, but also pays you interest for the money which is not yet invested.

For any other case, go with a fund of fund approach like or use the MF route through Motilal Oswal Nasdaq fund, etc