Guys, take a breath, or three.
When you're reloading, you're putting little tiny bombs together. A typical 9MM will run up around 32,000 to 34,000 psi and it goes off right in your hand. Over and over and over as you shoot the magazine empty.
Now the pistol is set up to work with the brass case to contain that pressure so that the only thing that leaves the pistol is the bullet and burning gases out the muzzle and the hot empty out of the ejection port/slide.
Any failure to contain that pressure can destroy that pistol and possibly parts of the person holding the pistol.
That's all the guys here are trying to do. Help new guys insure they are making SAFE reloads that will function well in their guns. The internet is full of pictures, and stories, of people who put unsafe reloads together and fired them, or bought unsafe reloads from someone else and fired them. Destroyed guns, bleeding hands/fingers/arms/cheeks/foreheads, etc.
No one wants to see that happen to anyone else. You only get a measure of someone else's skill and experience from what you read here when you yourself get enough experience to begin understanding how what they tell you really works. To some measure, that's true for all of us. I continue to run into things I've not seen before an I've been reloading since 1978 for several rifles, pistols, revolvers, calibers. Got something funny going on now I'm going to start another thread about.
If someone explains and you don't understand, first think about what you read, maybe you'll figure it out, maybe not - but it never hurts to come on back and ask for more details and try to better understand it. Sometimes, we don't understand everything we think we know (my dad used to say that to me and my brothers).