Leadership coaching is not a formal discipline, nor could it ever be: there isn’t a universal definition for what “leadership” even is, nor a single leadership style that will work equally well in all circumstances.
Strengths-based coaching will amplify your existing skills but also your weaknesses. Mindfulness training will make you more mindful. Advice from a charismatic advice-giver will either work, or it won’t… but either way, you can’t develop enduring skills by outsourcing responsibility to someone else.
My own leadership development practice is centered on goals. Every person and every group is always moving towards its goals. In a very real way, our goals create our worlds.