New in Mathematica

Hi, I’m new in Mathematica, i have some experience using Maple, so now I’m testing Mathematica, but is there any help command? I mean like an index where I can search for example how to solve an equation (I know that is with the command Solve), but where can I find all the commands?
Another question is what is the browser plugin?

Under Help choose Wolfram Documentation.

Paul.

The browser plugin is so that CDFs (for example items from http://demonstrations.wolfram.com can be active in a browser.

The same documentation you get within Mathematica using the Help > Wolfram Documentation menu selection you can find on-line at Wolfram Language & System Documentation Center.

Moreover, don’t overlook the many screencasts and other resources you can reach from Wolfram Support Quick Answers: How to Install, Purchase, Transfer, Upgrade....