- Edited
Sophia Another aspect that hasn't yet been explicitly mentioned is that two triad chords next to each other on the circle of fifths will always have a note in common which contributes to why moving between them has such a natural flow. If we look at the IV chord and the I chords, both include the tonic (for instance F and C chords both have the note C in them). Similarly, the I and V both have the dominant (C and G chords both have the G note.)
It can be argued that the very reason why the fifth is included in both minor and the major triads is that it is the second most consonant interval after the octave so it is very easy on the ears. On the other hand the fifth on its own doesn't carry much character or add much extra info. A fifth chord, also called "power chord" or "rock chord", with only the two notes root and fifth lacks any major or minor character.
Fun fact: The circle of fifths is considered so useful that the chord buttons on accordions are arranged according to this progression. Next to the column of different C chords you would find the F chords and the G chords on either side, thus minimizing the movements needed for the most common chord progressions.
This is also why some people advocate practicing your chords in the sequence of the circle of fifths (both clockwise and anti-clockwise). That way your hands will get used to the most common shifts between chords. Obviously this will not cover 100% of chord shifts in popular music, but it is a good start.
Youtuber David Bennet has a lot of videos in which he demonstrates different chord progressions with several popular music examples. I think it is useful to listen to examples like that and then play around with the progressions on your own to get a feel for them and not just read about the theory. Here's one video of his. Chapter 6 focuses on the three chord progression "I V IV V". Chapters 1 (I V vi IV), 2 (vi IV I V) and 5 (I vi IV V) are also of interest for beginners as they too focus on some of the most basic progressions.
Lower case, such as "vi", indicates that they are minor chords.