There are several YouTube channels I link in possible resources I give for students working on practicing Spanish, reviewing it or for references. Here are a couple examples of channels specifically for grammar/vocabulary building, reference and review.
https://www.youtube.com/user/gringoespanolhttps://www.youtube.com/user/tontitofritohttps://www.youtube.com/user/SrWoolyYouTube is a FANTASTIC resource for finding cultural material. I use a variety of videos that are both didactic (made for learners) and authentic (made by native speakers of Spanish for other native speakers, e.g. a clip from a newscast in a Spanish-speaking country). The amount of video resources from other countries is a great resource for teachers. Here are only a a couple examples
https://www.youtube.com/user/BBCMundohttps://www.youtube.com/user/cnnenespanolcom