Help auto prediction on my q10

Hello People. When I type the letter d on my Q10, it brings up a funny word. How can I change the output for d back to d?

Thanks<

Hello and welcome.
Under settings/Language and Input/Prediction and Correction....
You can do a number of things there. At the very bottom is Clear learned words since that must be why a funny word pops up with the letter d. The will clear ALL learned words, including those you type a lot that your phone has learned however.