The Kodansha Kanji Learner's Course, also known as the "KLC," is a well-thought-out textbook to help you remember 2,300 kanji with mnemonics and carefully picked kanji vocabulary.
Since it was published in 2013, it's built up a reputation as one of the best textbooks for learning kanji. Just like the other very popular kanji textbook, James Heisig's Remembering the Kanji, it teaches kanji with component parts (they call them "graphemes") and provide mnemonics to remember the core meanings of kanji. However, the KLC offers a more updated and thorough approach and features focusing on helping learners gain genuine literacy.
KLC is a textbook after all, it doesn't come with an integrated system to review what you've learned, such as SRS-based flashcards. Instead, there is a series of nine graded readers available as its supplemental resource. These graded readers are basically a collection of mini-reading exercises (often a single sentence) that use the kanji that you've learned from the textbook.
Overall, the Kodansha Kanji Learner's Course is a well-designed kanji textbook for not just helping you become familiar with kanji, but actually be able to read Japanese text in real-life. Read the Best Kanji Learning Programs for a more in-depth review and comparisons with other kanji learning programs.