According to Vedic Astrology, Saturn represents labor and hard work. During challenging Saturn periods, we typically learn the most difficult lessons that we are supposed to learn in our life. These lessons, however painful they are, help our soul progress on its journey. In the horoscope Saturn represents our past actions towards people who are economically and socially at worse condition than us. Many people when they have power and money, may ill treat people below them and this comes back as the curse of Saturn and forces us to go through challenges in our life. The Karma that Saturn represents could either be from this life time and or from prior life times. When Saturn is favorable in the horoscope it helps the native to be a king or similar roles that will help them impact lives of many people (as political leaders or senior leaders of big companies). A strong Saturn makes the native work hard towards their goals and will always gets the results of their hard work
Saturn impacts the life of people in many ways - a) during Saturn major period that runs for 19 years. b) During Saturn sub period of other planets and c) through the Transit of Saturn (Sade Sathi for eg:) Most direct impact of Saturn is felt during the Saturn major period as it will have the full control over the 19 years. During sub periods, Saturn effects are ~ 50% of the main period and during transit Saturn impact is ~ 25%. From the above the worst period in a person's life could be when all the above factors happen together.
Saturn moved from Sagittarius to Capricorn on Jan 23, 2020. It will remain there for the next 30 months. This position is very favorable for Leo, Scorpio and Pisces Moon signs. Medium for Aries, Taurus, Virgo and Libra. Saturn is in the worst position for people born in Sagittarius, Capricorn, Aquarius, Gemini. and Cancer. People with these moon signs are advised to do various remedies as per vedic astrology including doing seva (self less service) to help others.