Are there any rules or suggestions about posting content that has already been posted in a personal blog? Ricardo Sánchez 👨🏽💻 ☕ on January 18, 2019
Go for it!
You can either use the RSS features in your settings or do it manually.
Folks usually put Originally published at such and such at the top or bottom of the post, but that's totally optional.
As long as you have the rights to post, go for it.