Soopa first you need to learn how to strafe on the ground,Then you can translate it to the multi-jumping. Basics to strafe are simple. Hold W and make one running jump and let W go and never press it. From now one you only use A and D to gain speed. Press jump+A(Move your mouse to the left slightly at the same time),now press Jump+D (and now move your mouse to the right slightly). Change mouse direction each time according to the side you are going left or right.Press A and then D with every new jump you make.
First jump press A (mouse slightly to the left) ,second jump press D(now mouse slightly to the right). Repeat same thing over and over.Remember you DO NOT USE "W" aka Forward because if you will press it it will not allow you to strafe and you will not gain speed. It will be hard to jump without W at first but in time you will get used to it.It takes time to learn.
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