# Introduction to Knowledge hub

The Pushwoosh Knowledge Hub provides essential information about key concepts related to user identification, device management, and campaign strategies. This section covers the following topics:

<CardGrid>
  <IconLinkCard
      href="/product/pushwoosh-knowledge-hub/device-identifiers/"
      icon="setting"
      title="Device identifiers"
      description="Learn about unique device identifiers in Pushwoosh"
  />
  <IconLinkCard
      href="/product/pushwoosh-knowledge-hub/types-of-registered-devices/"
      icon="list-format"
      title="Types of registered devices"
      description="Understand the different types of devices"
  />
  <IconLinkCard
      href="/product/pushwoosh-knowledge-hub/users-userids/"
      icon="heart"
      title="Users (UserIDs)"
      description="Discover how UserIDs work in Pushwoosh"
  />
  <IconLinkCard
      href="/product/pushwoosh-knowledge-hub/omnichannel-campaigns/"
      icon="puzzle"
      title="Omnichannel campaigns"
      description="Discover how to set up and manage omnichannel campaigns"
  />
  <IconLinkCard
      href="/product/pushwoosh-knowledge-hub/what-data-does-pushwoosh-collect/"
      icon="download"
      title="Data collected by Pushwoosh"
      description="Get insights into the types of data Pushwoosh collects"
  />
  <IconLinkCard
      href="/product/pushwoosh-knowledge-hub/security-certifications/"
      icon="approve-check-circle"
      title="Security certifications and compliance"
      description="Learn about Pushwoosh's security certifications and compliance standards"
  />
</CardGrid>

<Aside type="tip">
For developer-focused implementation details on device identifiers, device types, and User IDs, see the [Developer Knowledge hub](/developer/pushwoosh-knowledge-hub/).
</Aside>