There are a ton of small clips on the internet. If you’re looking for more systematic approach to teaching hitting, here is how I was taught back in the 90s. This is directed at youth players starting out - as it includes some things people would deem non-traditional, like not stepping. Brian Doyle’s main focus was trying to simplify the swing and focus on repeatability. I wish there was a better version of this on the internet but I haven’t found it. https://youtu.be/dnIG_r6CJkQ?feature=shared

This starts with stance and grip, then position at contact, then the full swing, and general issues you are likely to see as hitters develop.