Are There Exercises To Build Software Development Research Skills?
This article contains advanced google options to refine searches, you could make them into exercises for a work training simulation using Jupyter Notebooks such as "Search for stackoverflow intext: ag-grid AND module.ts", or exercises to walk git branches to become more familiar with the project. 

You could also teach them to create a personal database of questions they've already asked, and how to search it, just so they aren't asking senior developers the same question twice.