Ask a Buddhist friend to recommend me a book that you think is good for explaining the Amitabha Sutra?

You can first read Huang Zhihai's vernacular explanation of Amitabha Sutra, then read some explanations of Amitabha by Tiantai masters, and finally learn Amitabha repeatedly.

Tommy's Nest and Tommy Yuan Zhong's Nest are not suitable for beginners.