Hello everyone, I need to improve my reading speed and concentration. Is there any guidebook with this subject matter?

There are speed reading books out there to buy/check out, if you want. But studies have shown that speed reading is bad for comprehension.

Barring that you have any attention impairments or severe depression/anxiety, active reading is a great way to improve one’s concentration. It also drastically improves comprehension. Have a conversation with the author while you’re reading. Ask questions. Try to make connections between what you’re reading another other books or life experience. Physical actions can also help, like underlining important sentences, writing down your reactions, and circling words and sentences. Being physical with a book helps keep your attention on the book.