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The course had a secret weapon: Section 8: Debugging and Error Handling . Most beginners panic when they see a KeyError or IndexError . José taught Leo to read the last line of the traceback first. He taught try/except not as a crutch, but as a safety net.

It took 0.4 seconds. That same task would have taken a human three weeks. The course had a secret weapon: Section 8:

His spreadsheets were a mess of city names: "CHI," "Chicago," "Chicgo," "The Windy City." The course had a section on Strings and Methods . Leo learned about .lower() and .strip() . He wrote his first three-line script to standardize 10,000 city entries. He taught try/except not as a crutch, but as a safety net

Leo didn't become a software engineer overnight. But he became the person in the room who could solve the unsolvable problem. His spreadsheets were a mess of city names:

It starts at absolute zero—no prior experience, no math degree, just a willingness to type along. It ends with you building real applications: from automating Excel reports to scraping websites, from guessing games to data visualizations.

Leo stopped being afraid of red text. Red text became just a conversation.