The following sections contain hints to help you solve common problems. Note that you should also check the section "System Environment" in the Install Tool, in which TYPO3 will inform you about errors and warnings in your installation which might influence performance. Follow the advice given there to fix those issues. This helps to solve or prevent most issues.
During troubleshooting, in the "Configuration Presets" section of the Install Tool, under "Debug settings", you should select the "Debug" preset. This is especially helpful, if e.g. in the Frontend you only see a blank page. With debug settings activated, the PHP error message will be displayed, which will help you narrow down the problem.