KISS

A [u]chord[/u] is a [u]harmonised group of three or more notes[/u] played simultaneously.

The simplest chords are three note [u]triads[/u] comprised of the [u]root, 3rd & 5th[/u]. [u]Chords[/u] may contain more than three notes or the member notes may be at different [u]intervals[/u] from the root note.

The red circles in that Chord Finder diagram indicate the note the tonic or root note of a particular chord.

The white circles are member notes comprising the chord.

As to whether you're getting ahead of yourself, you can decide. That's all you need to know to answer your question and possibly for now, but these may satisfy curiosity if you want to go there.

Basics of Triads and Chords on the Guitar

Understanding Basic Chord Composition Music Theory