To supplement your learning and get better solutions, consider the following online resources:
Absolutely—if used as a learning aid, not as an answer dump. Most engineering professors assume you will have access to solutions. What matters is your ability to recreate the solution during a closed-book exam. To supplement your learning and get better solutions,
If your answer differs from the manual, don't just erase it. Identify exactly where the branch current or node voltage went wrong. To supplement your learning and get better solutions,