Writing is key for me. It helps me work through my feelings. It helps me identify pain points and negative feelings that I often suppress.
I am a life-long diarist, and it has been my friend for decades. I don't think there's any right way or wrong way to do it. Before computers, I hand-wrote in those black and white composition books. Then I switched to keeping a private diary in a Word document.
Now I use the app Day One. (dayoneapp.com) It's private--you set a password in order to open it, and I like it because there are NO bells and whistles. Plus, if you are trying to establish a daily habit you get a little pop-up every day with a mini-screen for just jotting down a few words.
I prefer not to blog about my feelings publicly because I'm afraid my internal editor will massage the truth for the "audience." I prefer to be ruthlessly honest (as much as I can be) to myself.
When I need ES&H and advice, I come here.
Good luck with your private blog!!