Biochem can be super intimidating at first but, in my opinion, it is incredibly cool once you start thinking about it. You're literally learning how the machinery in every cell of our body is working!
Anyway, my biggest suggestion is to try and look at the concepts that you are learning as a part of a larger whole. It can seem pretty monotonous and seem unnecessary to memorize all 20 amino acids, but if you think about how you are learning the 20 building-blocks of all life, you can see how relevant it can be! For things like amino acids, I highly suggest making flashcards or downloading an app. I had one one my phone (don't remember the name) that basically acted like flashcards.
Next, ask questions! This isn't a big issue for all students, but it can be for some, and with a topic as complex as biochem is can be invaluable to talk through new concepts and ask for clarifications. Many concepts build upon each other, so understanding the basics can make things much easier later on. Along with this, there are some very good YouTube videos (try to find reputable sources, like Khan academy or content posted by a university) that do a good job explain lots of different concepts.
Lastly, if you are like my and need to be able to really visualize the things you are talking about, buy a molecular model kit. These are the little model sets that come with colored balls to represent different atoms (carbon, oxygen, nitrogen, etc) and sticks that represent different bond. This way you can look at things like amino acids or metabolite intermediates and see how they might bend or fit or break or join.
Good luck and enjoy the awesome experience of learning Biochem!