Know the precedence of the logical operators
Logical expressions usually take the form of either:
(...) &&
(... || ...) &&
(...)
or:
(...) ||
(... && ...) ||
(...)
As a best practice, you should always parenthesize the expressions, as this helps people instantly recognize the groupings.
But know that the && and the || have different precedence.
Precedence
From the precedence table, you can see that the && has the precedence of 6, while the || has 5.
This means that the && gets evaluated before the ||.
From the examples above, the latter does not require the parentheses:
... ||
... && ... ||
...
Knowing that there is an implicit grouping for the parts of ||s, it's easier to decipher some expressions:
true || true && false
is equal to:
(true) || (true && false)
Nevertheless, if you write the code, it's always better to make the intentions explicit and don't rely on the reader knowing the operator precedence.
But it's likely you'll see code without parentheses, and knowing at least a few operator's precedence helps understand these expressions better.