In this journal I'd make one of my secrets public.
Every time I want to use an English expression that I'm not quite familiar with, I always first have a google for it. If there're a lot of hits, I'll then feel pretty confident to write it down. If not, it's still very likely to find the correct form according to the google results. Google is really an extremely rich source of English language materials. It's able to perfectly answer questions like "Do English speakers usually say this way?"
Frankly speaking, all the successful websites, such as Google, eBay, PayPal, and Yahoo, really has changed our ways of life significantly.
I think it'll be a great idea to write this "secret" into my journal. It's doubtless beneficial to share such experience with people from non-English countries all over the world.