do you give me some advice on what books are good for beginners to learn Mandarin?

Actually that depends, if you want to study chinese in its essence then only HSK1 book wont be enough, in our university course they teach us New Chinese practical reader it is available here in the pdf section (a red book) take the textbook and workbook 1 https://www.cchatty.com/courseware/new-practical-chinese-reader

If you are student or want to get a job in China, which means you need HSK certificate, then you'd better start with HSK 1 standard course (the books). You can buy them on "taobao", the online app.
If you want to use speaking Chinese in near future, then choose some "新目标口语”、“体验汉语生活篇”、”新丝路·初级速成商务汉语”....... There are many choices. But basically they are similar.
The key to learn Chinese is: 1. Start now; 2. No matter what you've learned, use them in your life.

"HSK1 standard course" book is good for beginners

It is depends on what's your goal,and I think HSK is a good choice for beginners.