While there is no such thing, legitimately at least, as adwords for free, there are many places online that will provide you with a lot of free tips and tricks to get the most out of your Adwords accounts.
But before you head off to Google to do a search there are a few things you need to keep in mind:
Adwords is a fairly complicated method for generating traffic. If you follow advice from someone who really isn't qualified it can cost you more than money. If you disobey the terms of service Google has established you might well get banned and that would be very, very bad for business.
In order to really master Adwords you will need to find not only the training but you will need to be able to spend money while you are testing your ads. The truth is that no matter how good the training you get is, it will still take time for you to tweak and perfect your ads. During this time you will almost be guaranteed to spend way more money than you make.
Google is always making changes to their Adwords platform. In order to get the most out of any tips or tactics you may find online it's important that you make sure that whoever is providing the tips has the most up to date information. You will really screw yourself if you follow outdated information.
Now,when it comes to managing your own Adwords accounts you need to keep some things in mind too. For one thing, you will need to track your results. Many people seem to think that this step is a hassle and they ignore it, but the truth is that you have to know where your clicks are coming from and how much they are costing you. If you try to guess, you will waste a ton of money.
It's important to test all your ads to find out what combination of headlines and body work the best. To do that you will have to make changes to the ad until you can pinpoint the exact right combination. Make sure that during the testing stage you only make one change at a time. If you change more than one element during your test you won't have any way of knowing which change actually worked.
Don't go into your Adwords account as if you were in Vegas. What I mean by that is don't place all your eggs in one basket, don't blow all your money on one campaign. That never really works.
Since you will need to test ads and you probably will make very little, if any, money during the test it's imperative that you set a realistic ad budget and don't go over that budget. That way you'll have enough money to follow through and find the ads that work.
If you really want to do an Adwords campaign the right way you'll probably be better off skipping the adwords for free hype and find a legitimate course that can explain the complexities of pay per click to you.