To order a list of numbers, think of them on a number line — smaller values sit to the left and larger ones to the right. For integers this is straightforward, but decimals catch people out.
When comparing decimals, line them up by their decimal points and compare column by column from left to right: $$0.7 \quad \text{vs} \quad 0.65 \implies \text{tenths column: } 7 > 6, \quad \text{so } 0.7 > 0.65$$
The most common mistake is assuming 0.65 > 0.7 because 65 > 7 as whole numbers — but once there's a decimal point, the columns have to be compared in order. A longer decimal is not automatically bigger.
Negative numbers follow the same number line logic: $-3 < -1$ because $-3$ is further left, even though 3 is larger than 1 as a positive number.