A little trick I have found useful is to transcribe a record that is readable, and use this as a model to read other records. If (or when) the church changes the requirements or style of the record, make a new template.
Baptism and marriage records tend to follow a prescribed formula, with the only difference being names, dates, and places.
As your proficiency increases, you will find that you no longer need the aid to read the essential facts from the records.
BTW: I agree with the Kathy’s ... it is filius or filia.