Try these, all free: topstartups.io, angel.co, otta.com. Source: 11 months ago

+1 always apply directly to the job posting on the company's site. More likely to get seen. If you're looking for startups, topstartups.io is good, along with angel.co. Source: 12 months ago

Linkedin covers most use cases. If you want to go startup-specific, topstartups.io, angel.co, Otta.com. Source: about 1 year ago

Another one: topstartups.iohttps://topstartups.io/. Source: about 1 year ago

I've done this, but inbound leads isn't always the best. For OP, topstartups.io is similar to crunchbase but free. I also keep track of where my friends or friends of friends are working, and check in to see if they're enjoying it. Source: about 1 year ago

A youtube course will not be as helpful as really talking in front of people. At the end of speaking.io there is a great video on public speaking. Additionally, you can try courses on Udemy (there are a lot). Source: over 2 years ago

Ps - in addition to Seth Godin's advice, I got a lot of value out of this: https://speaking.io/. Source: about 3 years ago