Websites that are more Hardcore science. These sites are focused on gene identification behind disease phenotypes.
https://hpo.jax.org
http://genome.ucsc.edu/
https://www.gwascentral.org/phenotypes
https://www.encodeproject.org/
http://asia.ensembl.org/Homo_sapiens/Info/Index
https://omim.org
Omim is great if you know your genetic disease or condition.