LTE shares several similarities with 5G in the frame structure. Thus video explains the frame structure of LTE.
5G enhances the OFDM used in LTE. This video offers an opportunity to refresh your memory about OFDM!
Watch this video to see how multiple access techniques such as OFDMA and SC-FDMA enable multiple users to simultaneously access the network. Since 5G reuses these techniques, this knowledge will come in handy when you learn about 5G.
This video describes how Carrier Aggregation, an LTE-Advanced feature, significantly increases user throughput and cell throughput.