The answer to this question largely depends on the type of blog that you are planning to create. If you are interested in creating a general entertainment blog, then most likely you can write about movies without any issue.
However, if you are primarily interested in writing about film criticism or film history, then it may be more difficult to include movie content without infringing on copyright laws.
Generally speaking, if you are writing about movies for entertainment purposes only and do not intend to profit from your blog, then there is no need to worry about copyright infringement. However, if you plan to make money from your blog by selling advertising or selling movie related merchandise, then it is important to be sure that your content does not violate copyright laws.
Ultimately, it is up to you as the blogger to decide whether or not you want to include movie content on your blog. If you are comfortable with the potential legal ramifications of including movie content on your blog, then by all means go ahead and do so.
However, if you are unsure of the legality of including movie content on your blog, then it may be best to abstain from doing so.