It’s so easy to drop a stutch off the end of the needle. Even more experienced knitters can drop and end stitch. I always treat my row ends like they are soooo delicate!
Do you have some stitch stoppers (also called point protectors) to pop on the ends of your needles when you put your work down or away? If not then I suggest getting some, grey ont need to be fancy and can be super cheap budget friendly. Mine came free with some needles.
I agree with Shintoga, your knitting looks lovely and neat other than the dropped end stitch. You’re doing great.
We’re very happy to have new knitters here.
If your run hadn’t reached the cast on edge you could probably have fixed it - don’t feel like you always have to restart when there’s a mistake or a dropped stitch, it’s not always the case.