Hello, How could I see all my tracks visually on one map? Example, I did 4 trips in a month and would like to see tem all on one map. Not one by one but 4 on one map. Is it possoble?

You can view up to 4 activities in Garmin Connect Web. On the Activities page, select the activities, and hit the button Compare:

For more than 4 activities you would need and external app.