Nick Zentner, a geology lecturer from Washington USA, presents various videos on geology-related topics. The “Nick from Home” series, recorded during the Covid-19 pandemic, is particularly brilliant with 1 hour+ livestreams about a huge range of geology topics using a trusty chalkboard and various other props in his garden/house.
The London Geological Society has a lot of resources for learning and teaching, including several thematic microsites.
The British Geological Survey has a wealth of apps for you to explore the geology of the UK. Take a look at their iGeology App, also available in 3D.