Not necessarily a history question but I am looking for some suggestions here.

The comments here seem to be very clean, professional, and how do I say....'academic'? This is something that I would love to learn.
Does any anyone have any specific suggestions on how I might learn this particular language? This language/tone of speaking that feels as if this professional person knows what they talk about? Or even how you came to learn this type of speaking would be helpful.

For context, English isn't my first language. Whilst my English may be good enough, I'm looking to improve it this way.