This is an extremely valuable page at the Adobe site. Be sure to use the ON THIS PAGE Menu to Cycle through all of the color options:https://helpx.adobe.com/indesign/using/color-1.html
Select text with text tool or object(s) with selection tool before trying to apply changes
This page link covers applying color via the
(1) Toolbox (fill box and stroke box)
(2) Swatches panel Menu bar>Window>Color>Swatches
(3) the Color panel Menu bar>Window>Color>Color
(4) Color Picker double-click fill box or stroke box in Toolbox
(5) Control panel
(6) the Eyedropper tool tool box
https://helpx.adobe.com/indesign/using/applying-line-stroke-settings.html
https://helpx.adobe.com/indesign/using/gradients.html
https://helpx.adobe.com/indesign/using/spot-process-colors.html#about_spot_and_process_colors
Change these settings from the swatches panel.
Choose the Swatches menu and then find the Color Mode. The top two choices are RGB and CMYK. More on these color settings: https://envato.com/blog/rgb-vs-cmyk-guide-color-systems-designers/
link:https://www.techwalla.com/articles/how-to-get-pantone-colors-in-indesign
You can't load a swatch library in the same way as Illlustrator:https://forums.adobe.com/thread/1670966