Can someone explain how to use Banner of Command and Zz'Rot Portal

Best strats I see for tanky champions who don't really need damage and rely more on their bases or CC to carry them like Singed and Braum. With ZZ rot, you place it in a bush, and get that tiny bit of extra damage onto the tower slowly especially with those sieges, with banner, you use on a large minion then when your team is pushing a different lane, it forces the opponent into a desicion, lose the other lane to a mega minion, send one of us to stop it and be in a 4 vs 5 fight, or stop the minion and lose the tower to the players going down on the other.

I find their most common use is to make another lane push towards the enemy team while you apply pressure elsewhere.

For example, if you want to push top lane or take Baron, you would use the item in the bottom lane beforehand to have your minions threaten their bottom tower.

Another use may be to allow tanks to splitpush. While some tanks can push waves quickly, many of them cannot truly threaten towers since they deal so little damage to them. A promoted minion or a Zz'Rot portal can allow them to take the turret much more quickly.

Zz'Rot portal is especially good for a splitpushing due to the movement speed bonus it gives near turrets (dead or alive). This MS buff allows a champion to quickly flee when enemies come to stop and kill them.

Also, rushing Banner of Command on some mid-laners is a great way to annoy an enemy Karthus or Heimerdinger. It can be so hard to stop the push.

Keep in mind, a Bannered minion is completely immune to magic damage, so it's great against AP wave clear comps.

Banner of Command is Pretty fire and Forget. You don't need a ton of effort to use Banner to increase your pushing power. Typically, you get it on a support who scale well with the AP. And use the legion passive to relieve the Jungler of getting a locket. Usually the Jungler is responsible for getting a locket to increase team survivability. but if a support can get the legion passive instead, it frees them up to purchase a more greedy defensive item. This is why is a popular pickup in the LCS.

Over all, you want to activate your promoted minion in a side lane and then push a different lane.

ZZ'rots portal is a bit trickier. It was designed to give Tanks the ability to Split push. That in mind, it obviously isn't the best tank item. So picking it up kinda defeats the purpose of picking a tank. (when you could have picked a better splitpusher.) I've experimented with picking up Portal on Tank Supports. Though it doesn't seem to give enough utility to be an effective support item.

If ZZ'rots portal is place anywhere close to your lane, it will help the lane stay pushed. and if it's placed close enough to an enemy tower, it will help knock it down.

I think you are speaking about the actives...

... for Banner i think its pretty neat... you can recall buff a cannonminion on sidelane and go to help in the dragonfight... even if the buffed minion doesnt cause the sidelane to get pushing again you at least delay the minionsiege on a tower.

As Zz has such a low range it cant be used that way... i really dont see the point of this active as well...

the stats for both items are quite nice in some situations... :)

For the zz'rot portal: http://www.skoth.net/gamesblog/thinking-with-zzrot-portals-league-of-legends

tl;dr: Zz'Rot Portal is almost 100% gold efficient and the single highest MR item in Summoner's Rift.

Almost whenever you use the Zz'Rot Portal's active, Void Gate, you force your enemy into a lose-lose situation, and it's up to you to take advantage of the decision that they make.

When sieging, place your Void Portal as the minion wave passes so that the strong Voidspawn will appear with the minion wave.

When sieging, be ready to engage on your enemy when they venture out of the safety of their tower to destroy your Void Gate.

When sieging, wait for your entire team to arrive before setting up your Void Gate so that it isn't destroyed before you have the chance to defend it.

If you're split pushing and more than one defender is sent to deal with you, hold off on using your Void Gate - you won't be able to defend it and it will be destroyed quickly. Rely on your team to take advantage of their numbers advantage.

You can use the Void Gate to guarantee that a wave will always be pushing in your favor, creating pressure in another lane.

You should put the Void Gate in the same lane that your team is in if you're having trouble engaging, because it will force the enemy to come out to try to destroy it. You should put the Void Gate in a different lane than your team is in if you are confident in your engage and ability to tower dive, because it will force your enemy into a 5v4 when someone goes to deal with the pressure that your Void Gate is creating

Void Gate can be used defensively, and is most effective in that regard if you are able to plan ahead.

The best way to use the Void Gate defensively is to place it near a lane on the enemy's side of the map while your enemies are beginning to set up on your side of the map. Make sure you have enough time to recall and join the defense.

Void Gate can be used to separate waves and stall super minions.

Void Gate can also be used as a last-ditch wave clear tool at your tower.

Zz'Rot Portal has good synergy with Hand of Baron (Baron buff) and Banner of Command

You can create a lot of pressure by setting up a Void Gate to attack Nexus Turrets with super minions.