It depends on what you want to build if SaaS and digital goods are your game.
#1 Producthunt
#2 https://www.indiehackers.com/
#3 https://kern.al/
The entrepreneur Reddit is, in my opinion, not that valuable.
What I always recommend is to follow those who you deem as wise on LinkedIn or Twitter.
I'd like to recommend The Solopreneur Community on Facebook (https://www.facebook.com/groups/...). Full disclosure, it is hosted by my company, LifeStarr. But there is no selling/pitching allowed, just awesome solopreneurs helping each other. It's free as are the associated events.
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Growth Hackers Guide To Producthunt
Growth Hackers Guide To Producthunt