Nearly any topic related to swimming is welcome. Chances are that there's someone else at the same stage in swimming that you are. The best way someone can give advice on technique is to actually see how you swim, and then make suggestions based on that observation. However current technology doesn't enable us to get such a nice picture. So the more you can describe about your particular problem, the easier it is for others to offer helpful suggestions.
Large messages can be hard on system traffic as well as causing problems with some newsreaders.