推荐回答（4个）
陷阱卡在通常情况下需要盖放一回合，也就是说你这回合盖放后到对手的回合就可以发动了
特殊情况下有盖放当回合就可以发动的以及陷阱在手牌发动的，比如有处刑人·魔修罗或者王家之神殿在场时可以直接从手牌发动陷阱，喷气小飞机被选作攻击对象时可以手牌发动陷阱
在有这样的特殊条件下，各种类型的陷阱只要能对应其特殊动作（如怪的召唤、魔陷发动等）都可以发动
陷阱卡一般要对应对手的动作才能发动，比如抽卡、召唤、攻击宣言等，对于新手来说一般可以认为是对应着对手的动作发动陷阱
如果老手的话还会判断发动时机等问题，比如可以改变怪兽ATK数值的陷阱，一般都有攻击宣言或伤判阶段等好几个时点发动，发动时间不同怪的攻击力就不一样，这是后话了
不对应对手动作的陷阱也有不少，比如强欲之瓶可以在大部分时点发动，一般的永续陷阱比如王触王弹重力网也可以在大部分时点发动（包括对手的和自己的）
其他一般情况自己摸索就好，多打几场就知道哪个时点发动是最好的
速攻魔法可以在自己的回合内从手卡发动，比如旋风
覆盖的速攻魔法和陷阱一样必须要盖一回合，可以在对手的回合发动
覆盖后的速攻魔法不能在盖放当回合发动（通常魔法可以覆盖当回合发动，但特殊状态下按特殊状态下效果处理，比如有晴明、魔封的芳香、荷鲁斯之黑炎龙LV8在场上存在时）
速攻魔法可以在准备阶段、伤判阶段、结束阶段等特殊时点发动而其他种类的魔法（通常、装备、场地等）不可以
这个具体可参照百度百科
发动时点的技巧也是需要多战斗就能摸索到的
陷阱卡覆盖的那个回合不能发动。
一般来说，可以在对方的阶段宣言·抽卡·召唤动作·卡的效果发动以及自己回合的任意的时点发动。
部分卡只能连锁特定的效果发动。
陷阱卡覆盖的那个回合不能发动，当对手召唤，进出回合，抽牌，发动魔法陷阱怪兽效果时就能发动，速攻同理
陷进卡
盖卡的回合结束之后，满足条件，任意时点发动
速攻魔法
握在手里：满足条件，自己回合任意时点发动；盖在场上：盖卡的回合结束之后，满足条件，任意时点发动
任意时点是指对手做出任何动作（召唤，发动效果，攻击，伤判等等）/流程（抽卡，准备，主要1，战斗，主要2，结束）的开始与结束时
更加具体的，请参阅各个卡的调整
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