In this video @Brendan Jowett Used seprate Flow For check Availablity can we use Directly it from Retell to calcom without using this check availability template

i dont have chatgpt paid apis i am using gemni how to solve this please guide

I’m starting to get serious with n8n and want to build real-world, client-ready automations. Before I go too broad, I want to master a few high-impact workflows that are actually in demand and sellable on platforms like Upwork. For someone aiming to offer n8n automation services professionally, which workflows should I learn and build first? I’m looking for practical, in-demand workflows — not just demos — that will give me a solid foundation and help me understand triggers, HTTP/API work, data handling, branching, and integrations. What would you recommend as the first 3–5 workflows to master to get real paying clients fast?