The Same Four Steps

The four-step pattern you learned still applies:

$1.$ Define the state. What does $dp[i][j]$ represent? Write it in plain English.

$2.$ Find the transition. How does $dp[i][j]$ relate to smaller subproblems?

$3.$ Set the base cases. What are the simplest subproblems you can answer directly?

$4.$ Extract the answer. Which cell (or combination of cells) gives the final answer? Nothing changes except you have more indices. If you can do 1D (one-dimensional) DP, you can do 2D (two-dimensional) DP.