One per tool. Each answers the same six questions, so once you have read one you know where to look in the rest.
Which book is paying the most for a bet you already want, and whether that price is good enough to take at all.
Which prices on the board are better than the bet is actually worth, and how much of your bankroll each one justifies.
Which pairs of books currently disagree enough that covering both sides returns more than it costs, and exactly what to stake on each.
What a specific token at a specific book is worth in withdrawable cash, and the two wagers that realise it.
Whether the bets you are actually placing are good ones — which is a different question from whether they have won yet, and is answered by a different number.
Which opportunities are worth being interrupted for, written as rules the engine checks on every cycle so you do not have to sit on the board.
Where two books are far enough apart that some results win BOTH bets (Middles), and where covering both sides costs least (Low Hold). Two boards, one screen. Neither is free money.
Which plays are available entirely on exchanges — where both sides are tradeable market prices rather than a bookmaker's offer — and what those prices really cost once the venue's fee is taken at fill.
What a bet you type in is worth: what to stake on the other side, what a parlay of it pays, and what it converts to in cash. For markets you supply yourself, not ones the site found.