Does meditation provide us mental calmness and free thinking ?

It is meant to allow time for the mind to reset in the context of fatigue and ever increasing worries. It does not work the same for all and proper circumstances for meditation may differ from person to person.

Yes, meditation can assist with stress, anxiety, and worry. Your cognitive abilities will be enhanced by unburdening yourself of the emotional alterations, allowing more direct concentration and focusing without as much distraction.

Meditation is like a diet. A given type of meditation does not work for all. You need to find what kind of meditation works for you For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!