This is a draft cheat sheet. It is a work in progress and is not finished yet.
Debug query
debug(GeneralUtility::makeInstance(Typo3DbQueryParser::class)->parseQuery($query));
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Objects
/* @var ConfigurationManager $configurationManager /
$configurationManager = $this->objectManager->get(ConfigurationManager::class);
/* @var TypoScriptService $typoScriptService /
$typoScriptService = $this->objectManager->get(TypoScriptService::class);
/* @var FlexFormService $flexFormService /
$flexFormService = $this->objectManager->get(FlexFormService::class);
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content ID
<div id="c{record.uid}" class="content">
<p>Hello World</p>
</div>
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always add content ID to content elements to keep compatibillity with typo3 core
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