Most of the mechanic parts are the same as normal bikes, that require maintenance over time. Maintenance requires certain skill. If you are not sure how to do the work, please ask professional technicians from a local bike store.
Do not lubricate brake discs to prevent brake malfunction.
Do not disassemble the battery or the drive unit, or poke things into the terminals of the battery. Clean the male terminals on the battery but do NOT use water. Don’t spray any lubricant into the wire ports or force them into the components.
Do not water-wash the E-bike. Use wet towel to clean.