To where can I upload my game

I have game on Unity. Can you advise a good site, to where I can upload it for free?
I don’t want to sell it, just let my friends play it for free and without registration.

It is desirable that on the site advertising was not much

itch.io is a free all in one solution if you want it on a games site. There’s even a private page setting that lets you share a link for friends/testers before publishing to the public.

Try GameJolt, many people use to publish their indie games and play other peoples indie games. There is a lot of first time game makers if you are still a beginner developer.

GameJolt

There are two ways you could host it:
Dropbox - What most people do.
Blog - I.e Blogger, Tumblr, Wordpress with it hosted on Dropbox/alternative that allows HTML embeds and embed on the blog

I run a site called simmer.io if you want to give that a shot. At the moment it is for WebGL only.

Do you just put the file on dropbox

Nextgamingera.com is an option. They are a new website that works with indie game devs and other content creators. You cant just upload your game, they will check it first but most of the time its just stuff like mute buttons on the main menu and stuff like that, that you have to add to get approval. Try it out, you never know its such a new website that you might get a job with them instead.