Hello, I need some help if you don't mind 😇

Yes, the link is correct.

The most recommended textbooks are always Tae Kim’s Grammar Guide (online and 100% free - you can even print it as it has no copyright problems) and Genki.

Personally, Tae Kim’s main problem is that it lacks exercises and Genki felt a little boring to me. However, most people seem to enjoy both! So, I would advise you to give Tae Kim’s grammar Guide a try (because it’s free) and buy the Genki one if you can afford it. I honestly believe that learning in two different perspectives is helpful, since no textbook is perfect for everyone. Make sure to buy the Genki workbooks too (just like in your link).

For more resources, check this link: