Here's a tutorial for basic box division:
Divide the box into two columns:
Draw an imaginary vertical line down the center of your page to split it into two columns of equal width.
Divide the box into three columns:
Mark third points across your page and connect them to split your page into thirds. Use straight lines instead of curved lines for cleaner edges.
Divide the box into four columns:
Find the centermost points to split your page into quarters. Draw the vertical lines to split your page from those points.
Divide columns into further sections:
Within a column, divide into further sections as needed by finding proportions. For example, you could divide a quarter column into thirds to create 3/12 sections.
Leave spacing between columns:
Leave some blank space between your columns to create separation and improve readability. Start with a small amount of space and adjust as needed.
Adjust column widths:
Experiment with different column widths based on the layout and content. Wider columns can make content easier to read while narrow columns allow for more columns on a single page.
Add drawn elements:
Once you have your column structure, sketch in elements like headings, images, sidebars, graphics, etc. within the appropriate column sections.
Hope this tutorial helps! Let me know if you have any other questions.