What is the main structure of automobile suspension and how to fix the wheels so firmly, especially the front wheels?

Rear wheel suspension is relatively simple, so let's not talk about it. Let me talk about the front wheel. Generally, the front wheel is fixed at three points. If it is a double rocker arm (that is, there is one rocker arm at the top and one rocker arm at the bottom, such as an off-road vehicle), the two rocker arms are in the shape of an inner splayed triangle (which is beneficial to stability), and the outer splayed end has two endpoints at the top and bottom, which are connected with the wheel positioning drum on the tire centerline. Those two rocker arms are used to fix the outward or inward balancing force of the wheels and the impact force of the road surface. If it is a precursor, it will also bear other forces such as the reaction force of the driving wheel. Another point is fixed by the steering rod, which controls the directionality of the tire and cannot swing casually. Because the first two points are not at the lateral center of gravity of the tire, all forces will make the tire swing forward or backward around those two points, so the steering rod also bears the pulling force of the tire swinging due to various forces.

If it is a single rocker arm (a common mini-car, of course, including family cars and other common cars), the force is the same as that of the double rocker arm mentioned above, but because there is no separate upper rocker arm, the damping spring shaft above the positioning hub not only reduces the impact force caused by uneven ground, but also bears all the moments that the upper rocker arm should bear.