Little math problem(s) April 2019

[pier4r]

There is a deck of 52 cards. 26 red and 26 black. Shuffled.
The host is going to turn one card at time.

You get 1 dollar/euro/pound/<equivalent unit of money> each time you correctly predict the color of the card turned. You get nothing if you fail.

What is the best strategy for the game, to maximize the expected value of the money got from the game?