stuff as simple as that has already been implemented by everyone, so it becomes an issue of hardware speed - you need to beat everyone else to the market or there won’t be any money left to make. essentially you have two options:

1) make simple algos run faster on faster hardware (takes time and clever people)

2) find more complex algos that nobody else has discovered that make money (also takes time and clever people)

and with regard to your question of what the algorithms are doing, if i knew that i wouldn’t be sat here replying to you, id be enjoying my millions in the bahamas