Shigoto o shimasu

I'm surprised that “shigoto o shimasu” is translated is lesson 4.8 as I work. I thought it was hatarakimasu

こんにちは (Konnichiwa) Abgueguen,

Thanks for your question!

働きます (Hatarakimasu) is indeed “I will work.” 

仕事をします (Shigoto o shimasu) literally means “I will do a job,” but it's usually translated as “I work” since “I will do a job” can sound a little unnatural in English. 

To say “I will work today," you could say either 今日は仕事をします (kyō wa shigoto o shimasu) OR 今日は働きます (kyō wa hatakimasu) - the meaning is exactly the same. 

I hope this helped. Please let me know if you have any other questions. 

勉強を頑張ってください！ (Benkyō o ganbatte kudasai!)