What terminology confuses you?
I would start by just learning what all the various item affixes do and which items can roll what affixes.
Generally speaking you want to have high All Resistances on gear, decent Vitality/Armor, Main stat (Strength in your case) to increase your defense. You also want Crit chance and Crit damage on all pieces of gear that can have it (so rings, gloves, amulets roll both... Helm and Bracers roll crit chance) with high weapon DPS that has a socket in which you put out a maxed out Emerald gem (for extra Critical hit damage). Attack speed is dependent on builds, you usually want to have Cooldown reduction instead of it (especially for you because you use Crusader so you definitely want Cooldown on gear). Every equipment that can have sockets should have sockets (this includes Helms, Chests (3), Pants (2) and weapons). For Rings/Amulets in this version sockets aren't as useful but in 2.1 sockets in Jewelry are going to be very much desired so hold on to those). Some items also have bonuses to various skills so look out for items like Helms/Boots for Fist of Heaven affixes and Chest/Shoulders for Heaven's Fury affixes (as those two are the main skills in the two most powerful Crusader builds).
In general it's really difficult to mess up in this game build wise. You can allocate Paragon points where ever you want whenever you want, you can freely choose among active and passive skills. Items are the main thing and it's not that hard to tell good ones from bad ones. Just don't look into Sheet DPS and Toughness that much, they aren't completely accurate. Rule of thumb is that you want to have as much Armor/All Res as possible as opposed to having health.
You also want to be farming the difficulty where you can easily kill packs even if it's below Master or what not. Even Normal is fine if you are under geared. Collect Fragments via Bounties and do Rifts. Use shards acquired from Rifts to gamble for slots that you are weak in until you get all Legendaries in all slot after which you start gambling for very specific items (in your case you would want the Akhan full set).
