You should use it every day, even if you don't exercise, as your cells need to be saturated with creatine to get all its benefits.

Some studies conclude that taking it in post-workout is the best option. However, if you can't, take it at any time of the day.

No. Remember that muscle building needs habits such as regular exercises, a balanced diet and sleeping at least 7 hours in a row. It also requires a dose of effort, perseverance and discipline.

Yes. There are studies that suggest the use of creatine to stimulate the brain and delay mental fatigue.
Other uses that have been found are:
⚫︎ Against depression: the brain consumes more energy than the rest of the body combined and when there is little energy negative thoughts prevail. By increasing energy with creatine, you can improve mood.
⚫︎ For the heart: by increasing the strength of all muscles, it improves the function of the heart. It also helps lower triglycerides and improves the action of insulin.
⚫︎ More memory: Creatine has been shown to improve memory and mood in people who sleep little.