Yeah, there are quite a lot of exceptions but “-e is female, otherwise is male” works most of the time. Then if you want to be more precise you can remember some generic exceptions like -age, -isme are male and -tion, -té is female. You’ll still have some exceptions like une souris, une vis, une dent, un câble, un graphe, un cône, une image (exception to the exception) but it probably works in about 80-90% of cases.