Books would be the best place to start learning electronics. Ask around, the names of authors like Malvino, Bell etc will pop up. Many of these books actually start with vacuum devices, but you can skip those sections, unless you need some trivia :-)) Start directly with the semiconductor devies.

But if you are looking for on-line tutorials, a search on google would be a good idea. But as far as I've seen no site can compare to the classics of Electronics literature.

Kundi