Develop module
The Develop module is where you edit your photos in Lightroom Classic. This is where you'll find all the panels for exposure, colour, detail and masks on the right-hand side. You switch to it with the keyboard shortcut D.
In the Develop module you work non-destructively: you adjust sliders without changing the original, and everything is reversible at any time. The panels run top to bottom in a logical order, from basic to detail. A handy workflow is to start at the top: profile and basic settings first, then colour, then detail and masks. Tip: press the eye icon or letter next to a panel to switch that effect off briefly and see the difference.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.