Yes, Thor has the potential to beat Thanos in certain storylines. It depends on various factors like the circumstances and Thor's power levels at the time.
It depends on the specific comic storyline and context. Sometimes Thor shows great strength and can give Thanos a run for his money, but other times Thanos has the upper hand.
Yes. In 'Infinity War', Thor has a significant role. His journey to get a new weapon to face Thanos is crucial. Thanos, on the other hand, is the main villain driving the plot forward as he tries to collect all the Infinity Stones. Their fates are intertwined throughout the movie.
Thanos usually defeats Thor through his immense power and strategic planning. He might use his Infinity Gauntlet or some other powerful weapon to gain the upper hand.