This is the 1347th most frequent Portuguese word.
escrever
To write.
The word 'escrever' is used as the infinitive verb describing the act of writing.
Eu gosto de escrever sobre viagens.
I like to write about travels.
Here, 'escreveu' is the conjugated past tense form of 'escrever' referring to the action of having written.
Ele escreveu um livro sobre história.
He wrote a book about history.
In this sentence, 'escrevendo' is the present participle form of 'escrever', showing continuous action.