I would like to emphasise the two most relevant things for teachers these days, 1. methods of data aggregation and 2. methods of data display.
Online there is in fact an almost inexhaustable supply of free stuff, so aggregation just means methods of finding and retreiving what you need as quick as possible, for instance by means of rss, search engines, AI etc and display just means how you then present this to your students.
The presentation is crucial. In fact, how intutitive webpages or a presentation are is often what decides their usefulness. I know this stuff because i am 50, and i began making hobby educational websites in the early 2000s, almost everything has been about history and literature. My early attempts were of course pretty basic. But these days a lot of ready made or modular solutions exist. There is no need even for coding. An educational tool these days may not even have to involve the production of original content.