You’ll be taken back to your Google chat session. Click the blue right-pointing arrow to the right of the chat box; a panel ...

This article explains how to link to another slide from within a Google Slides presentation. Instructions for both the desktop website and the mobile app are included.

Since Slides is a web app and each slide has a unique URL, to link to one, you just have to click it in the left pane and copy the URL directly from the address bar.