Give your watch a quick check on a regular basis, wiping down the face and bracelet with a soft cloth, checking the leather on a strap, and making sure that the strap or bracelet is firmly attached to the watch face. Also, while many watches are water resistant, few are truly waterproof, so if you find that moisture or dust has penetrated the case of your watch, bring it into your local Ben Bridge store where we can have one of our watchmakers clean it out for you.
Our best advice on watch maintenance is to never attempt do-it-yourself repairs, no matter how handy you are or how good the instructions are on Youtube. Watches are super complex little machines and only an expert watchmaker should be trusted to get a watch back into working condition. Attempts by an untrained repair person may seriously damage the watch and can even invalidate factory warranties.
In general, having your watch checked regularly by your Personal Jeweler or watchmaker and serviced according to the manufacturer's guidelines should keep it in excellent shape.