Tight is right

Check that all your main bits are totally secure on your bike. 

There should be no movement in your cranks.

Check for movement in the headset bearings by pulling the front brake and rocking the bike back and forth. 

How are the stem bolts and handlebars? If there’s any movement, tighten.

In all of these cases, tighten things if you feel confident. But be careful of more advanced fixes when it comes to your bottom bracket and your headset. Always seek professional advice: never say “it’ll be fine”.