Determine the modulo 4 remainder of the following sum: $$ 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12. $$
Grouping residues helps make some series computations easier:  \begin{align*}
1 + 2 + 3 + 0 + 1 + 2& + 3 + 0 + 1 + 2 + 3 + 0\\&\equiv 3(1 + 2 + 3 + 0) \\
&\equiv 18\\
& \equiv \boxed{2} \pmod{4}.
\end{align*}