Act as a GDPR compliance consultant with 10+ years of experience helping startups navigate data protection laws. Provide a detailed step-by-step guide for [YOUR STARTUP] to ensure compliance with the General Data Protection Regulation (GDPR). Include actionable advice on [DATA COLLECTION PRACTICES], [USER CONSENT MANAGEMENT], and [DATA SECURITY MEASURES]. Explain how to appoint a Data Protection Officer (DPO), if required, and outline best practices for handling [DATA BREACHES] and maintaining transparent communication with users. Tailor your response to a [TECH STARTUP] operating in [EUROPE], ensuring all recommendations are practical, scalable, and cost-effective for early-stage companies.