Guidance on how to navigate the official documentation

Here is a challenge task

Configure the web-route to split traffic between web-service and web-service-v2.The configuration should ensure that 80% of the traffic is routed to web-service and 20% is routed to web-service-v2.

Note: web-gateway, web-service, and web-service-v2 have already been created and are available on the cluster.

Could anyone tell what is the most efficient way to navigate the documentation to solve this question.
Also any tips and tricks on how to to search and navigate the documentation in general for any topic would be much appreciated. Thanks in advance