The author notes that writing skills can be improved when reading. This goes hand-in-hand

Vocabulary

Explanation:

One can improve his or her writing skills by reading more and more. Reading more content and variety of content helps to get introduced to good vocabulary.

This good vocabulary will help in writing good and bulky content. The more one will read, the more one can write.

Exposure to new words helps in understanding the content and also helps in writing your own content. There are different styles of writing, introduction to new words, observing the fluidity and cadence can also  help in improving the writing skills.