Hi, I learned that forming a firm can have many advantages (e.g. tax). I wonder if I create a blog or a youtube channel, should I create a firm for it? What are the pros and cons? Thanks.
Depends how serious you are imo. If you are brand new and haven't generated any income it's easiest to treat it like a hobby first and you can file a schedule C as a sole proprietor if you start earning. If you are able to start generating regular income and plan on putting in a lot of time for the long term then forming a corporation becomes way more worth the time, setup, maintenance and liability protection.
I agree with sfpf. Forming a business and maintaining it can be time consuming and also costs money. Give yourself a chance to try things out first like a hobby and once you pick up steam and are dedicated to working on your projects long term, then consider incorporating.