The first, and arguably most important, step is to organize your data in a clean and consistent manner. For the sake of future steps, it is useful to use Google Sheets.
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Freeze the first row (View/Freeze->1 row) to secure the column headers at the top of the sheet.
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Set up your columns with headers. These should be one word and lowercase. If you need more than one word, style like
firstSecond(no space, second word capitalized). The absolute basic & essential columns are:
- latitude
- longitude
- label or popupContent