I have JSON-formatted survey data with feedback from different technology courses (Python, SQL, R, etc.). Help me identify significant differences in sentiment, strengths, and weaknesses across these course types. Focus your analysis on: 1. Which technology has the highest overall satisfaction and why? 2. Are there common weaknesses that appear across multiple technologies? 3. Do completion rates correlate with overall ratings? 4. What are the unique strengths of each technology course? Provide your analysis in a structured format with headings for each question, and include specific evidence from the data to support your findings.