New spoon feeders need training for the motor patterns of holding, scooping, lifting and placing a spoon in the mouth. It is quite an involved process for little ones involving visual perceptual skills, motor development and coordination of the fingers/hand, wrist, arm, shoulder, neck/head and mouth. Breaking the steps down, giving hand over assistant to program success, and practice, practice, practice will help the process.
You can begin with the following.
Help the child grip the spoon while you place your hand over his. Together scoop and lift the spoon with you releasing after the food reaches his mouth. Allowing the child to independently remove the spoon from his mouth will increase his awareness of his new role and build on his success.
Teaching him to place the spoon back in the bowl/plate and scooping again will likely require your hand over his to achieve at first. Continue helping him lift the spoon toward his mouth removing your hand at the point that he can be independently successful.
As you continue this process, fade the hand over his assistance to just holding the tip of the handle to assist with hand position (most will initially turn the spoon over upside down once it reaches the mouth until the wrist pattern is learned).
It is important that he has lots of time just to explore manipulation of the spoon independently with food too. You may just want to begin with giving assistance for part of a meal and allowing him to continue finger feeding and exploring with the spoon on his own.
Beginning practice with foods that stick best to the spoon will provide the most initial success.
Our occupational therapist sometimes recommends bent or curved spoons for children with motor difficulties, but promotes regular child-sized utensils for typically developing children to encourage the wrist development that is needed for these devices and later writing skills.
Be prepared for the mess and celebrate success! Most of all, watch with wonder the development of your little one at every stage of growth!