I work on a thesis, with several chapters.

Where the chapter 1 of the book is called Introduction & why is it called Introduction and why? When we want to say “ABC is defined in Chapter 1”, I feel I can avoid using “Chapter 1” “Introduction”

What is correct: “in the introduction” (referring

1. to the general concept of introductions/conducting), “in introduction” (referring to
2. Chapter 1 by its name); neither, both or something
3. completely different from the original. The main point was to go over each section through the introduction of a chapter.

What is the best answer for staying tuned to technology in this era of innovation?