hi - welcome to the forum!
when you say “platform,” do you literally mean a trading platform, or are you (as I suspect) actually asking for a recommendation for a broker?
there are plenty here
personally, i think it’s hard to do better, overall, than Oanda, and it has a few specific advantages over some other brokers, namely:-
- it has “infinite position-sizing granularity,” which is basically a pompous way of saying that it’s set up to handle penny trades, and whatever future multiples of those tiny sizes you rightly want to start on, after demo
- it’s well regulated (absolutely essential!) and they’re honest people
- it has much better charting (“trading platforms”) available than most forex brokers - specifically, what they call their “advanced charting” (don’t panic: it isn’t very “advanced”!) is their own version of a very good trading platform more widely known as TradingView, and i recommend it … but in this context anything that avoids the one called MetaTrader is worth thinking about
good luck!