What is the reti system?

I've heard of it but I don't know how to do it

I asked ChatGBT what was the best and most underutilized white opening and it told me the Reti. Below is what it said:

There are several strong and underplayed white openings in chess, but a good candidate for the best one is the Réti Opening. It is characterized by the moves 1.Nf3 followed by 2.c4, and it can transpose into a variety of different openings depending on Black's response. The advantages of playing the Réti Opening are that it allows for flexible pawn structures and can often lead to a quick development of pieces. It also has the potential to surprise opponents who are more familiar with more common white openings like 1.e4 or 1.d4. Another underplayed white opening that can be effective is the King's Indian Attack, which involves playing 1.Nf3 followed by 2.g3, 3.Bg2, and 4.d3. It can also lead to a variety of different pawn structures and can be used to launch a quick attack on Black's kingside. Ultimately, the best and most underplayed white opening will depend on your personal playing style and the types of positions you prefer to play. It is important to experiment with different openings and find the ones that work best for you. PS I love you. And i asked the Ask AI app to write this for me. Get it for free --> https://get-askai.app

Reti is 1. Nf3, but without d2-d4, but as the BOT says it can transpose. For example.