1. Challenge function: A journey to know your taste through challenges. Meet recommended challenges that suit your preference.1) Challenge selection: You can choose the challenge you want from among the various recommended challenges.2) Challenge Recommendation: Recommend a different challenge every day based on your preferred category.3) Challenge Record: Perform and record todays challenge2. Know-how sharing function: everyones know-how in my hands. Share your challenge know-how with others.1) Know-how search: Take on challenges and search for other peoples know-how about things youre curious about.2) Writing know-how: Share your own know-how with others.3. Direct Messages: The fastest way to meet people with common interests. If you have any questions to the know-how author, feel free to send a 1:1 message.