I recommend this site if you are looking for premium Wordpress themes and plugins
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Thanks for sharing.
Are these reputable providers in terms of "clean code", I'm a newbie when it comes to cleaning themes or anything of that sort. if you could recommend a way of checking that would be perfect!
When downloading from some of the sites above (like mafiashare etc) you should always check for code, backlinks etc. I know for a fact that mafiashare and myapploadz.ru alter the styles.css, and footer.php files . This doesn't mean that they necessarily put bad code inside, most of the times they just change the developers site url with their own.
On the other hand, if you see on your styles.css file things like "Theme shared by xxxxx" it's a good idea to check it.
The first thing you could do is download an Exploit scanner like grepwin. Run the program and search the downloaded folder (R-click and choose grepwin) for strings like "mail(" and "eval(" If you find any, open the source file and clean.
After, use grepwin again to search for cracker info in the theme like the one I mentioned above (if you see "shared by xxxx" inside the styles file, run a search about "xxxx") Sometimes i find variants of this e.g the name of the group with spaces between the letters e.g. x x x x
Then you can run TAC for WP and see if anything else pop-up