> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://docs.helixo.co/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Getting started concepts

To make full use of the upsell apps, you need to know some terminologies, and concepts which are used as the basics in creating the app. 

#### Concepts

1. [What is a Funnel?](https://docs.helixo.co/en/article/what-is-a-funnel-1e2yzt1/) 

2. [Upsell vs Cross-Sell?](https://docs.helixo.co/en/article/upsell-vs-cross-sell-vzq2ym/) 

3. [What is a downsell?](https://docs.helixo.co/en/article/what-is-a-downsell-83ebcf/) 

4. [What's a funnel trigger?](https://docs.helixo.co/en/article/whats-a-funnel-trigger-c21435/) 

5. [What is a widget?](https://docs.helixo.co/en/article/what-is-a-widget-tpcir4/) 

#### Basic usages 

1. [Create a Simple Discounted Cross-sell Offer?](https://docs.helixo.co/en/article/create-a-simple-discounted-cross-sell-offer-10bpme/) 

2. [How to create bundles?](https://docs.helixo.co/en/article/how-to-create-bundles-l4j1vx/) 

3. [How does volume discount work?](https://docs.helixo.co/en/article/how-does-volume-discount-work-14hc0ba/) 

4. [Create BOGO (Buy X Get Y)?](https://docs.helixo.co/en/article/create-bogo-buy-x-get-y-1r3irqy/) 

Hope you've got some value from this article. Let us know your feedback 🙂  We are excited to hear your thoughts.

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