The offending F chord this one is a common chord used in multiple songs and for most beginners the hardest to learn and play. There are a few ways to play this chord and the one you choose will depend on the sound you are after so it is best to learn all of them at some point. However to start with I see two or three options to experiment with once you have the fundamentals with posture. The F shape most start with is similar to the C shape and uses all four fingers. The shape First, index finger on the C note first fret B string Second, middle finger on the A note second fret G string Third, ring finger on the C note third fret A string Fourth, pinky finger on the F note third fret, D string This may feel uncomfortable to begin with, if you practice it with a C chord and a G chord you have the shapes to play a few classic songs. When you play this version of the F chord only hit the fingered strings. Once you can play a full F chord it is a moveable position. Good luck with this one Let me know how you get on