To make a table in MathJax, you can use the LaTeX \begin{array}{} and \end{array} commands. Here is an example of a simple table with two columns and three rows:

```latex
$$
\begin{array}{|c|c|}
\hline
\text{Column 1} & \text{Column 2} \\
\hline
\text{Row 1, Column 1} & \text{Row 1, Column 2} \\
\hline
\text{Row 2, Column 1} & \text{Row 2, Column 2} \\
\hline
\text{Row 3, Column 1} & \text{Row 3, Column 2} \\
\hline
\end{array}
$$
```

This will produce a table with a border, two centered columns, and three rows. You can customize the table by changing the number of columns and rows, adding or removing borders, changing the alignment of the columns, and adding more complex formatting.

Note that you need to enclose the table code within double dollar signs ($$) to render it as a MathJax display equation.

Here's a breakdown of the code above:

\begin{array}{|c|c|}: This command starts the array environment and specifies the format of the table. | creates a vertical border, c centers the text in the column, and || creates a double vertical border between the columns.
\hline: This command creates a horizontal border.
Row 1, Column 1 and Row 1, Column 2: These are the entries in the first row of the table.
\end{array}: This command ends the array environment.
You can replace the text in the table with your own data, and adjust the formatting as needed.

I hope this helps!
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