There are countless books, tutorials, and videos that can help you get started with Landsat data. The resources below are a small subset that provide instruction on how to access, download, process, and analyze Landsat data.
Landsat Data Users Handbooks provide a basic understanding of each Landsat mission, the spacecraft and sensors, data processing systems, and the resulting products created and made available for download.
Supporting information for Landsat 8:
+ Landsat 8 OLI and TIRS Calibration Notices (December 15, 2019)
+ RIT Scientists Recognized for Solving Issue with Landsat 8 TIRS Instrument (June 7, 2019)
+ Landsat 8 Thermal Data Ghost-Free After Stray Light Exorcism (October 31, 2017)