We're going to check out the Boom-Chika strumming which is synonymous with Country, Folk or Blues style and notably Johnny Cash!
To achieve this, we can simply cycle round the pattern 'D DU':
D DUD DU per bar to a count of 1 - 2 - & - 3 - 4 - &
Strumming tips
Accented strumming
Beats 2 and 4 are the main beat but all the other beats are 'weaker' or quieter ideally
Using the thumb
This gives us greater control over the strings being played, means we have to be less accurate at times too