Something I'd share every time a friend asks me: Where can we meet?
I really like this resource because right after answering questions related to specific situation, it immediately gives you the link related to the platform issue and it lists organizations that can help you.
I chose this resource because it gives you an overview of social media platforms and security issues, yet you can go deeper in each as this piece has so many links to other tools and how-to's related to protection of your data.
I like this resource because we've used it for filming protests and especially for organizing teams when filming! Other resources on this website cover documenting data during internet shutdown, encrypted galleries, tactics and strategies!
I like this guide because it gives you a thorough overview of tools available for surveillance protection.