There are many ways to blog in two languages. The most common way is to simply translate your blog posts into the other language, and then write the posts in the second language.
You can also use a blog translator or online translators to do the work for you.
Another option is to use a blogging platform that allows you to create posts in both languages simultaneously. This can be a great way to keep your blog content fresh and current in both languages, without having to spend time translating each post.
If you want to go a step further, you can also use bilingual WordPress plugins or themes that allow you to create separate blogs for each language.
Ultimately, the best way to blog in two languages is to find what works best for you and your blog. Whether you choose to translate your posts or use a blogging platform that allows simultaneous posting in both languages, make sure that you are taking advantage of all the available options available to you.