Laws of the Game including Kids, u/19 and IRB Laws Rugby Tactics Includes basic animated drills & moves - great little website
Better Rugby Coaching - More drills but limited access without paying, can subscribe to free newsletter which occasionally has some good stuff but a lot of advertising. If you don’t mind paying, there are a lot of resources available on this website.
ARU website - Includes videos of drills but not a lot of variety.
NSW Rugby website - Click on” coaching resources”. Limited drills but worth a look. Again, would be good if they built on this website.