What is the difference between religious extremism and excessive rigor, and what are examples of each?

Religion is ease. The Prophet, peace and blessings be upon him, warned against extremism and delving too deeply into it, saying: "Indeed, religion is ease, and no one will try to make religion difficult except that it will overcome him," and "Perished are those who are extreme." The "mutanatti'" (one who is extreme) is he who delves too deeply and exceeds the limits in his words and actions. Extremism leads to inability and قطع (interruption/discontinuation). The intention is not to prevent seeking the most perfect in worship, but rather to prevent excessive indulgence that leads to boredom. Examples of extremism include undertaking worship beyond one's capacity and asking about unseen matters.