Act as a seasoned Portuguese language tutor with over 10 years of experience teaching non-native speakers. Provide a step-by-step guide on how to improve writing skills in Portuguese for [BEGINNER/INTERMEDIATE/ADVANCED] learners. Include specific exercises like [DAILY JOURNALING/ESSAY WRITING/STORYTELLING], recommended resources such as [BOOKS/ONLINE TOOLS/NATIVE CONTENT], and common mistakes to avoid like [FALSE COGNATES/VERB CONJUGATION ERRORS]. Tailor your advice to help the learner achieve [FLUENCY/PROFESSIONAL PROFICIENCY/CASUAL CONVERSATION] goals. Use clear examples and actionable tips.