Have to learn to walk before you run phrase informal
Don't rush into doing something advanced before you know the basic skills, techniques and primary details
You cannot skip this step. You have to learn to walk before you run.
Small things make big things, so he has to learn to walk before he runs.
To lose the skill or advantage one used to have in the past
Said when someone has the skill or competence in something and could use it anywhere
Used to refer to a set of methods or items that one can use to achieve something.
Don't know anything about something
Don't rush into doing something advanced before you know the basic skills, techniques and primary details
The verb "have" should be conjugated according to its tense.
The phrase may have derived from the 15th century.