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https://support.steampowered.com/kb_cat.php?id=13
You're not even a limited user.
But here,
https://support.steampowered.com/kb_article.php?ref=6748-ETSG-5417
Right mouse click the user on your Steam friendslist > [Invite to Trade], or go to their profile > [More > Offer a Trade]; should it be on a trading forum, you'd likely find a Trade Offer -button.
http://help.steampowered.com/en/wizard/HelpWhyCantITrade
Edit: Just realized this was a necro
Anyway, I'm done necroing this. OP should be able to see their restriction in the link above.
You can but some of those items will become "not tradeable" in their inventory, like gems for example.