This would mean inspecting the bearings, checking the chain and cassette for signs of wear, and doing the same for the brake and gear cables. Anything that doesn’t look like it’s up to the job should be replaced as soon as possible. All of these tasks are easy enough to do at home, but if you’re not feeling confident then just head down to your local bike shop.
Once you’re happy that everything is running smoothly, don’t forget to lube the chain using a thicker lube than usual. This will last longer is rubbish conditions than lighter lubes, keeping your drivetrain running smoothly.