If you have your money ready for the process, you can use the same for all countries, but the processor to use will be different. If you have a little money you want to invest in bitcoin, you can first start with converting that money into USDT, which is one of the most popular pairs you can use, and then use an exchange or medium that is favourably available in your country. You can buy bitcoin with as low as $10, depending on the minimum trade amount of the exchange you use.
It's not the same in all countries because legality of Bitcoin is very different in many nations globally. With better adoption on Bitcoin, its legality becomes better recent years but it does not mean you can use bitcoins 100% similar in all or most countries.
Owning and storing bitcoin are easy and nearly same around the world, but if it is about trading, you might have legal issues with governments.