Passage
and Amminadab begot Nahshon, and Nahshon begot Salmon,
and Amminadab begot Nahshon, and Nahshon begot Salmon,
Ruth 4:18 Now these are the generations of Pherez. Pherez begot Hezron,
Ruth 4:19 and Hezron begot Ram, and Ram begot Amminadab,
Ruth 4:20 and Amminadab begot Nahshon, and Nahshon begot Salmon,
Ruth 4:21 and Salmon begot Boaz, and Boaz begot Obed,
Ruth 4:22 and Obed begot Jesse, and Jesse begot David.
The verse centers on "amminadab", "begot", "nahshon", and "salmon". It is saying that the verse draws attention to "amminadab" and "begot", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 19's "and Hezron begot Ram and Ram begot..." into verse 21's "and Salmon begot Boaz and Boaz begot...", so "amminadab" and "begot" belong inside that flow. In Ruth context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "amminadab" and "begot" with trust shaped by these words, not by a vague optimism outside the passage.