I agree 100% with Cancer on his article of trigger control/practice, these techniques apply to shooting any pistol.
Many years ago I started shooting using a High Standard Supermatic Trophy which had a nice trigger, I also shot a Colt GCNM and a S&W 629 both also had great clean breaking triggers.
I got out of firearms when I had my three sons. However, I kept practicing pistol shooting using Olympic class air pistols, I had two older Walthers. The triggers on these guns are super sweet! Very light pull, crisp, with a very clean break.
When I got back into firearms a few years ago my first pistol was a West German Sig P226 with the SRT. In SA this gun also had a fairly nice trigger. I got another Colt GCNM and it too had the trigger I remembered.
Then I got bit by the Glock 'cool aid' and purchased an OD G17 Gen 3.
That gun has the worst pistol trigger I have pulled.
I see people have posted train, train and train. But come on, the trigger is gritty, heavy and mushy, with a fairly long reset!
Sure in a combat, or fast action shooting match it may be good. But if you want to work on accuracy, IMO a nice trigger is an asset.
Otherwise why do match/target pistols and rifles come with light, clean breaking triggers?
I feel that the disconnector is a cheap fix, and as posted above more items/parts need to be addressed.
I recently installed a Vanek trigger kit in my G17, all I can say is WOW!
I like this trigger more than some of my other guns now. Light, clean pull/break with a much shorter reset.
I bought a Zev Tech trigger for a Gen 4 G35 I was going to buy, but I ended up coming across a like new Gen 3 G35, so I plan to sell the Gen 4 trigger and buy either a Gen 3 Zev Tech or another Vanek for my G35.
That's my two cents on Glock triggers.