What are the best tech communities to build your brand?

Online tech communities are an excellent place for founders to meet like-minded people, learn, and share what they're working on.

For many businesses, building a community can be an effective marketing strategy. As the organic reach of followers decreases, many brands have turned to build engaged communities to enrich the relationship between themselves and their followers.

What are the best communities across the internet to build your brand and gain loyal customers?