Following are the easiest and simplest principles to lead happy life 

• Love, honour and obey your parents
• Love, respect and obey your teachers, parents and elders
• Love, trust and obey God
• Thank God for His gifts. Pray to Him to guide you in your thought, word and deed
• Keep your body, mind and soul clean
• Drive away evils such as laziness, anger, pride, envy, selfishness, greet and falsehood
• Avoid bad company
• Work sincerely and honestly
• Never cheat and never steal
• Tell the truth and avoid telling lies
• Help the poor and needy
• Keep the body fit by doing exercises