Before writing, spend five minutes planning: thesis (your opinion), two or three arguments and the conclusion. The text almost writes itself afterward.
The introduction has three parts: set the context, present the problem and reveal your thesis. Short and direct beats ornate.
Avoid starting with “Nowadays…”. Prefer a fact, a question or a strong statement that grabs the reader from the first line.
In practice
PlanThesis + 2 arguments + conclusion before writing.
IntroductionContext → problem → thesis, in a few lines.
AvoidClichés like “Since the dawn of humanity…”.