Everyone is different, so no advice applies to all. While I agree that the average student may want to be careful, don’t let that discourage top students from going after what they think they can handle. DD completed her first semester of 18 credits loaded with nothing but Engineering and Math classes and did extremely well. Reading some of this advice about 1st semester freshman and being careful with what you take had me as a parent worried she was overloaded at first. Many people suggested that she should start with Calc 1 even though she had a 5 on the AP calc exam (and loved Calc in HS). She took Calc 3 and did terrific.
You just have to know your student.
my 2 cents