The answer to 'how to fix leak repair' is to first identify the source of the leak and stop the water flow. This may involve turning off the main water supply or shutting off the valve to the affected fixture. Once the water is stopped, you can begin the repair process.
Depending on the type of leak, the repair steps may vary. For a leaky faucet, you may need to replace the washers or cartridge. For a leaky pipe, you may need to tighten connections, replace a section of pipe, or use a pipe clamp. For a toilet leak, you may need to replace the flapper or fill valve. Always turn off the water supply before attempting any repairs.