My survey questions is a series of Likert scales, where there are 3 questions for each motive category (therefore 5 Likert scales in total).

With this dataset collected, I would like to do the following:

1) Compute responses for all 3 questions under 1 Likert scale

2) Compare between the Likert scales to see which has the highest score

3) Compare responses between different demographics

As I am fairly new to stats, I am not sure what are the best types of statistics test to use for each of the above 3 questions. I have thought about using t-tests but I'm not sure if it is appropriate in this case. I would really appreciate any feedback or advice given.