If it is calligraphy, I strongly recommend Tian's calligraphy course. Mr. Tian is a rare and awe-inspiring calligraphy educator today. He mainly studies European regular script and Erwang cursive script. His calligraphy attainments are remarkable, and he has his own unique views on the characteristics of calligraphers in past dynasties. The explanation is very sincere and simple. What is commendable is that tian teacher never idolizes blindly, and always treats everything in calligraphy with a pragmatic and sober attitude. There are many videos of his calligraphy course on the Internet, you can have a look. I am a calligraphy lover myself. Personally, I think his calligraphy course is most suitable for beginners.
If it is pen calligraphy, I recommend Wu Yusheng's pen copybook. His running script is very good and practical. His copybooks are also easy to understand, and his brushwork is relatively easy to master and use.
Skills are endless, and so is writing. You can leave a message if you are interested. Finally, I wish you success!