Where is the best place to read manga online?

I’m very new to reading manga, and while I would like to have physical books, I don’t have the money nor the room for volumes at the moment.

I’m wondering, where online is the best place to read manga. I have found a couple random websites for the choice reads that I have looked for, but I’m wondering if there are any websites that I can find where there is a large collection of manga that can be found. If not, what are some of the best websites that can be used in conjunction with each other to provide most mainstream manga.

Also, if there is somewhere I could potentially download manga and that is a better option than just looking on the websites, I am able to do that as well.

Any other advice is appreciated as I don’t really know much about where to find or read manga, so all advice is helpful.