Keeping the story secret hahahaha I'm a disaster at it. For years I kinda gave up on the idea of, someday, actually drawing my comic, so, if I drew a scene at the end of the story that was super emotional and spoilery I just posted it because, hey, no one's going to read it anyway, I should just share my art.
That + the fact that if someone asks me something directly I tend to just tell the truth without thinking it twice makes it hard to now spoil anything hahaha. Thankfully, since most of my interactions with the readers are writen, I have time to think stuff through and not let spoilers run free x'D