How to fix a poor network connection?

I'm curious to know, what are some effective strategies for tackling a problematic network connection? Could you walk me through the troubleshooting steps one might take to identify and resolve the root cause of a weak or intermittent connection? Are there any quick fixes or long-term solutions that you recommend? I'm particularly interested in understanding how to optimize my router settings, manage bandwidth efficiently, and perhaps even consider upgrading my hardware if necessary. Any insights or advice would be greatly appreciated.