It can take some time to get used to which side each letter is on when using the split keyboard. However, a helpful feature has the keys hidden on the other side of the keyboard at the edge of each half.
For example, next to the T button is a hidden Y key to the right of it. Then on the left of the Y key is a hidden T key. If your thumb or finger is already close to it, it’s usually easier to tap these hidden keys.