The answer to 'how to get rid of mouse' is to use a combination of humane trapping, exclusion, and sanitation methods. Mice can enter homes through very small openings and quickly reproduce, so it's important to address the root causes to prevent an ongoing infestation.
Start by inspecting your home for any cracks or holes larger than a pencil width and seal them up with caulk or steel wool. This will prevent mice from getting inside. You can also use humane traps baited with food to catch any mice already in your home and release them outdoors. Maintaining good sanitation by storing food in airtight containers and regularly cleaning up crumbs or spills will remove food sources that attract mice. If the problem persists or you're uncomfortable handling the situation yourself, it's best to call in a professional pest control technician.