To have a clear mind is to stay calm and focus on any situation with a definite goal.

Thoughts flow in the mind at every moment. Being positive and clear in your thoughts can help to tackle any tricky situation.

If you want to clear your mind instantly, you could try meditation and yoga, these are approaches that work for most people. Alternatively finding peace in nature is another great way to clear your mind. To try to stop overthinking, remind yourself that it is not as complicated as it seems and focus on the actionable strategies that you can sue to solve the problem.