You can find here the material from the last ecCodes training course:
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<a href="https://software.ecmwf.int/wiki/display/OPTR/ecCodes%3A+GRIB+data+decoding+and+encoding+software" target="_blank">ecCodes Training: GRIB</a> |
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<a href="https://software.ecmwf.int/wiki/display/OPTR/ecCodes%3A+BUFR+data+decoding+and+encoding+software" target="_blank">ecCodes Training: BUFR</a> |
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There are also eLearning resources:
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<a href="https://www.ecmwf.int/assets/elearning/eccodes/eccodes1/story_html5.html" target="_blank">Decoding with GRIB tools</a> |