Beginner Mountain Biking

I just got my first bike as an adult a few months ago, and have been using it mainly on roads to get to different neighborhoods or work. I've been wanting to be outdoors more this summer and have been considering riding my bikes on trails. Does anyone have good recommendations/tips for a complete beginner to mountain biking and trail riding? I live very close to Frick Park and Schenley Park so beginner trails in those areas would be great. I am scared of super steep slopes and obstacles so I would love to start out with easy trails that are still enjoyable!

The bike I have is a hybrid - it has a commuter frame with mountain bike tires and front and seat suspension.