Combining puts two tables together, side by side with merge or end to end with concat; reshaping rearranges one table between wide and long form with melt and pivot_table. This cheatsheet gathers the whole toolkit on one page, from the four join types through anti-joins, validation, self-joins, and the two time-aware merges, each snippet annotated line by line. Keep it open while you wrangle data, or save the image and pin it nearby.
For the full background, read the guide to combining and reshaping DataFrames in pandas. To practise, work through the 10 code-along examples.
I hope this helps.
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