Everyone starts at the beginning. Education is a powerful tool. Taking classes would be a good place to start.
There's also a lot of free information at your disposal.
Hit the YouTubes and Googles for introduction videos and articles on your model pistol. What the parts are, how they work, how to take it apart and put it back together. How it operates and how to operate it.
And watch and read about gun safety. There is plenty of instructional material available.
When watching, pay attention to the person's posture and hand movements. Take note of their hand and finger placement. Notice how deliberate their movements are, and where the gun is pointing. Even when it has been emptied, many will hold the gun pinched between thumb and fingers in a position that couldn't possibly be fired. If the gun is in the palm of their hand, the trigger finger is straight out to the side in an almost exaggerated manner.
Take the time to immerse yourself in the rules, conduct and culture of gun safety. And also the function and design of your gun.
Everyone forgets or confuses the names of parts sometimes. It's important to know the names, but it's even more important to know what all the parts do and how they function.