Now that we have 3 chords at our disposal, the number of songs we can play along to has gone through the roof. That raises an important question: how can so many songs use those 3 chords but sound so different? The truth is, the chords and rhythm are a backdrop for the song, which is primarily the melody and lyrics. In fact, chord progressions don’t fall under copyright law, only melodies and lyrics, so you can take that chord progression from your favourite song and use it as the basis for your own song and nobody will come knocking at your door (except maybe to hear you play :))
Choose one of the following songs and practice along. If the strumming patterns give you trouble, no need to worry. Building a sense of rhythm takes time, and perfecting the simple patterns will lead to a better sense of rhythm which will improve your musicianship much more in the long run. Also, it’s worth it to play along multiple times – repetition is key. Every time you practice something, you get a tiny bit better at it. It won’t be noticeable on a day-to-day basis but overall it will lead to major improvements.