First of all it is almost impossible to give you suggestions on the troubleshooting steps from the information you provided. There could be hundreds and hundreds of different scenarios causing you the grief.
What I suggest you do is:
1. Try to describe your home network setup - Which modem you have, how you PC is connected, what else do you have connected to your modem/router - try to provide your devices model names.
2. If you have a lot of problems, try to capture and describe what problems you have - one by one and under what circumstance your network misbehaves. What did you do when the problem happened?
That would be a good starting point for self diagnosing problems.
If you want to have a quick resolution you always can engage with a local network/PC guru (home visit might be required) who should be able to diagnose and suggest the fix.
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