Production:
The back of the tongue is raised to contact the soft palate, back teeth, and gum ridge to form a seal, which completely blocks the air stream from coming into the mouth. The back of the tongue is suddenly pulled away to release unvoiced air pressure in the form of a sudden burst of energy. The /k/ sound is "unvoiced", meaning when you say it with your hand on your throat, you should not feel any vibrations. The /g/ sound is a "voiced" sound, meaning when you put your hand on your throat and say the sound, there should be vibrations.
Tips to say the /k/ and /g/ sounds: peachiespeechie.com/videos
These are just some examples of fun activities you can do at home to practice your speech sounds! Invent your own lists and stories with the /k/ and/or /g/ sound.