Concise: One fourth the number of pages of a typical general theology book.

Historic: The Westminster Confession, 1647, a doctrinal standard of the PCA, is frequently quoted.

A Guide: "The master theme of the Christian gospel is salvation. Salvation is a word-picture of wide application that expresses the idea of rescue from jeopardy and misery into a state of safety. ... What are believers saved from? From their former position under the wrath of God, the dominion of sin, and the power of death; from their natural condition of being mastered by many vicious habits that were part of it." p. 146-147.

The book has roughly 100 short articles on theological topics. There is a good index. It can answer many of your questions. It can lead to your glorification of God.