Many people who are unaware of this structure may assume it is a traditional threaded fastening system and try to tighten it like a screw—this is incorrect and dangerous!
When tightening by turning the handle, it’s also important to apply the right amount of force. Too much force can damage the skewer, while too little can create safety risks. How do you gauge the right force? If it's appropriate, you should feel a noticeable springy resistance when operating the lever—that’s a good sign. If you’re unsure, you can adjust the nut on one side of the lever to test and get a feel for it. The principle for positioning the lever: after tightening, the lever should point toward the rear or downward toward the ground to prevent it from scraping against objects during riding—this is also for safety. The tightness of the quick-release has nothing to do with the rotation of the wheel, so no need to worry about that. What you do need to be concerned about is whether you are using it correctly!
A proper way to check is: lift the front wheel and tap it downward toward the ground with your hand. If the wheel does not come loose or shift, it's secure. For the rear wheel, you can tap it toward the bottom bracket area.
Additional note: The turning motion of the handle is not axial but radial. That is, when tightening, imagine the ground as the X-axis. If the bike is standing normally upright and perpendicular to the X-axis, then the direction of the bike is the Y-axis. When tightening the lever, the motion should be from the X-axis toward the Y-axis, not an axial rotation along the X-axis. That kind of axial rotation is what we usually refer to as turning something like a screw—haha~~~