In a codeforces round, it is likely you cannot solve a problem. If you don't know how to approach it, try searching for problems that have already been solved similar to the one you are working on.
This site is intended to be used during the round to get problems of that particular category, and to present solutions to them.
For an example, round Round 92 Educational round had a problem related to LCM. The title said, "LCM Problem".
If you cannot solve this problem, you can search here for the word LCM, and get 15 problems from previous rounds related to the LCM.
Then after you have identified which problems are most like yours, you can look at the solutions for a clue. Its guaranteed that the solutions can give you ideas on how to solve the problem, even if they don't answer the question directly.
We order problems based on your search terms, and you can search on words in the problem statement, which is something you cannot do on codeforces.
You can also use this site as a training platform to group problems similar to one you have just solved, eg. Segment Trees that gives 20 problems related to the topic.
Alternatively you can have some fun with the problem set and go searching on things like "Colors", or Travelling and geometry
Recently you have been allowed to add problem tags of your own if you think it can help. Drop a comment or something useful to identify the problem (eg a tag such as Brute Force) might help someone looking for a brute force solution etc.
Good luck and have fun.