Advice
My advice would be to troubleshoot as much as you can, and if you are unable to fix an issue, set it aside for review later by yourself or a higher up. It can be frustrating not understanding some material, but you are there to learn! Remember that it is okay to ask questions, but you have to know when it is the right time to do so. Tackling other projects while your superior is busy shows them that you are motivated to complete the project even though you may be caught up on a task. Also, don't wait for you superior to spell out every single task for you, show initiative by moving forward in a project on your own. If you are unsure if your progress is in the right direction, stop what you are doing and consult a team member.