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p = The forest is dark
q = The moon is full. 
Start with
       The forest is dark or the moon is full.
Replace the words "The forest is dark" by the letter p.  Then you have
                        p or the moon is full
Replace the words "the moon is full" by the letter q.  Then you have
                        p or q
Finally replace the word "or" by the symbol "⋁".  Then
we have
                        p ⋁ q
Now to make a truth table, you need the rule for disjunction ⋁
Rule for disjunction:
If the truth values of what is on both sides of ⋁ are both F, then 
⋁ has truth value F.  Otherwise, it has truth value T.
p   q   p⋁q
T   T    T
T   F    T
F   T    T
F   F    F
Edwin