References
These are a few websites that are helpful for figuring out dungeons and dragons related things.
This site allows you (with registration) to access a virtual tabletop, in which you can place your tokens and move them around. You can also create characters and NPCs with the features provided, along with have multiple people in your session and voice/video chat with them. There is automatic dice rolling, which automatically determines how to modify your rolls to get the final number.
This site has many of the resources for a standard 5th edition game. You can read on classes, races, and many other things, however some content has been known to be missing. If you need information about something quickly, this is a good site to go to.
This site has lists of 5e information, along with the option to create characters, monsters, and encounters. It gives you a lot of information to go over when trying to create something, but is a good tool to use if you need to make things. You can use it without logging in, but to save your information you need to register.
This is a site with basic information on each of the main few classes and races. It gives information in more of a story telling kind of way, with less about what features the classes/races get. If you want to introduce a friend into dnd and have them learn more about some of it without going too in-depth, this is a good site to use.
This is a site that has both 5e and homebrew content. You can (with registration through twitch) create your own character, magic items, and pretty much anything you could need in a dnd world, plus it provides a great reference to those who need something new to add to their campaigns. You can also upload any homebrew content you make so that others can use it in their campaigns.