Whether you're building an app, launching an online store, or offering a service - someone needs to be there to talk to your customers. At the very least, set up a chatbot on your website. From there, you can expand into popular messaging channels: Telegram, WhatsApp, Facebook Messenger, and of course, email.
Your users should always have a clear way to ask questions or share feedback - and that means customer support must be functional from the very first day.