this or patrickJMT or tisdell (the unsw math lecturer) has some videos on his channel or just random videos on youtube
I found a playlist on ODE's in like 5 seconds: https://www.youtube.com/watch?v=HKvP2ESjJbA&list=PLwIFHT1FWIUJYuP5y6YEM4WWrY4kEmIuS
and if you need help with a specific...