1. Leakage at the shower faucet outlet

That is caused by the wear of the axial gasket in the shower faucet. Use pliers to loosen and remove the gland bolt, use a clamp to remove the axial gasket, and replace it with a new axial gasket.

2. Leakage at the gap below the shower faucet bolt

That is caused by the wear of the triangular seal in the gland. You can loosen the screw to remove the bolt head, then loosen and remove the gland, then remove the triangular seal inside the gland, and replace it with a new shower faucet.

3. Leakage at the joint of the pipe

Generally, the cap nut is loose, then you can tighten the cap nut again or replace it with a new U-shaped seal.