Hi Ron,
Several points there which I will try and answer based on my experience. I have tried to play guitar since 11 I am now 67, I started playing again after a +20 years hiatus when I did a BTEC Music performance course, we had to learn and perform 3 new songs every 2 weeks. Learning or playing the songs was the vehicle to gaining experience, how to learn, musicality, Music theory, learning/improving guitar, playing with others. It was hard, at least I found it hard. I found JustinGuitar Sep 2025, and it is one of the best guitar learning sites I have found, I did JG’s Grade 1-3 and am currently on the Blues Immersion course.
With respect to chords and guitar, they are one of the fundamental basics of playing the instrument. If you are referring to the open chords that Justin teaches then the course starts with these as they are generally considered the starting point when learning the instrument. They serve several purposes, they get a beginners fingers moving around the strings to get the shapes and in one are of the fretboard, it enables the beginner to play virtually any song with the simple shapes open C, A, G, E, D F & B, and simple variants of dominant 7ths and minor versions. you can use a capo to change key. A beginner learns some of these and then starts strumming, and again simple 'Strum patterns" are used to get you going, with variations, this allows you to develop co-ordination and very importantly timing and keeping tempo, and to count rhythms. Put all together it is not easy. A few points on this, some would argue that there is no such thing as a ‘strum pattern’, there is no simple answer IMHO, they do exist as Justin clearly demonstrates, but that is not the end of it, and why you may feel what you are playing does not reflect the actual songs, often songs are created with there own strumming rhythms(patterns), and feel and these can be complex and change in parts of the song (I hope the make sense).
I also used JG’s app for a while and I found it a bit basic for playing songs compared to others, I believe a new improve version is on its way and may be in Beta testing. As you progress and explore Tabs from various sources it will become apparent that for one song there may be many takes on it, and only a few may be accurate or close, If you look at JG’s ‘Wish You Were Here’ lesson (Grade 2) I recall, then it is pretty close to the original version as on the album, but some of the strumming is simplified into one pattern, if you look at this WYWH lesson you will see there are subtle differences in the rhythms and strumming, does it matter probably not, they both sound good. Also if you listen to various versions of WYWH recorded by Pink Floyd in their career it is never exactly the same.
To sum up Chords and learning them is very important, and you will as you progress move from open chords to barre chords and then variation of them and using chord tones and voicings. Grade 3 starts with barre chords. Chords are made from and fit into scales (major, minor, pentatonic and many more), this is very important to learn as you develop, and some basic music theory I would recommend you study. I would stick with JustinGuitar as you tutor and if you find a song you would like to play more accurately, then find a TAB or music that is accurate and after learning the basic way, learn that. I would avoid going off the many tutorial rabbit hole on the net, I have been there and it can be a big waste of time, better to stick with JG, practice and learn, it will be quicker in the long run IMHO.
Something you could try, which Justin suggests is to develop transcribing skills, pick a favourite song and slowly work out the chords from what you hear and writing them down along with the strumming and even the solo if there is one. Use Audacity(free) or Guitar Pro to slow section down and repeat bars to work out. You should end up play a close resemblance to it that you like. You will also develop your tonal listening skills.
I hope that helps a bit, keep playing and enjoy you guitar journey.