What "Systems" do you rely on to grow and manage your projects?

I am a Soloprenuer Bootstrapping Indie Hacker and I recently built an Online library of funding opportunities for Creatives- www.curatedfunding.com . For the second week I've been testing the concept of "themeing" my days.

Monday - Create Content
Tuesday - Distribute Content
Wednesday - Communication & Community
Thursday - Systems/ Automation
Friday - Research Awesome Things
Saturday - Screen Free
Sunday - Sharpen the Axe for the week.

As you can see today is Systems/Automation but I am wondering.
What are the "Systems" that you rely upon to grow/Manage your Projects/Businesses?