Typically you caulk joints between trim. You do not caulk the butt joints in siding, joint flashings are required at butt joints. The joint flashings can be metal or poly material such as "Bear Skin" flashing sheets. See attached document for more info. hardieplank-hz5-us-en.pdf
source https://www.inspectorsjournal.com/topic/18359-caulking-between-hardie-planks/?do=findComment&comment=173218
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