en_tn/rom/03/02.md

It is great in every way

Paul now responds to the concerns brought up in verse 1. Here "It" refers to being a member of the Jewish people. Alternate translation: "But there is great advantage to being a Jew" (See: rc://en/ta/man/translate/figs-explicit)

First of all

Possible meanings are 1) "First in order of time" or 2) "Most certainly" or 3) "Most importantly."

the Jews were entrusted with revelation from God

Here "revelation" refers to God's words and promises. You can translate this in an active form. Alternate translation: "God gave his words that contain his promises to the Jews" (See: rc://en/ta/man/translate/figs-explicit)