Q1. What is in your $CFG->wwwroot in the file config.php which resides in the main Moodle directory?
Q2. Different question, not an installation problem. People habe been asking for video helf everywhere. There is a request pending for a video (embede-media) forum of its own. Until then, you can post your question anywhere.
Installing and upgrading help
Domain name without (https://www) loads
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