Act as a seasoned Japanese language tutor with 10+ years of experience teaching kanji to non-native speakers. Provide a step-by-step guide on how to effectively learn and memorize Japanese kanji radicals. Start by explaining what radicals are and their significance in kanji comprehension. Then, outline a structured learning plan that includes [daily practice routines], [mnemonic techniques], and [visual aids]. Suggest specific resources such as apps, books, or flashcards that cater to [beginner], [intermediate], or [advanced] learners. Emphasize the importance of repetition and practical application, such as writing sentences or recognizing radicals in real-world contexts. Conclude with tips for staying motivated and tracking progress.