The question about "growing" here may have two meanings.
One meaning is the rank-up system. Regarding this, there is nothing you can do to fasten it more than the system allows you to. In order to rank-up you need activity points and merits. You may earn 1 activity point per day, if you create at least a post each day. So the part of activity is only related to you: if you make a post each day, you'll get the activity point; if you won't then you won't get the activity point. However, you can not do anything to break the 1 point per day limit. Regarding merits the situation is not related to you anymore. Or not only to you. This is because, first of all, you have to post interesting articles. Second condition is to have users appreciating your writing and merit you for it. So there is nothing you can technically do for obtaining merits, as they are up to other users. You, on your part, can only do your best to create good essays or make good contributions inside others' topics.
These two conditions - merit and activity - work only together. It's useless (in ranking-up) to have activity without merits and you can't have merits without activity, as merits are given, practically, for your contribution, meaning for your activity as a whole.
You can see the ranks and rank-up criteria here:
Forum ranks/positions/badges (What do those shiny coins under my name mean?).
However, take into account that acting solely with merits in your mind will not always help you obtain them and it may create a lot of frustration if you spend a lot of time to write something (which has zero-value, therefore is not merited) and in the end you realize you spent your time for nothing. Instead, try to not be greedy about the merits. Act freely on the forum, since you can't do anything to fasten your ranking up anyway and try to be as helpful as you can.The second meaning of growing is the one related to personal development. Now this is a very important part and, if you referred to this part and not to fast rank-up then you are on the right path. However, in this case it's also impossible a "fast growing". Why is that? Because learning takes time. It takes a lot of time. Imagine you take something from zero. Even if you don't take it from zero, the amount of imformation you may learn (if you really want to) is huge. It's simply huge. From technical debates to collectible items to forum history; from there to learning about how to prevent yourself from being scammed and from here to various projects being developed. It's an entire universe of information and you may learn from almost every topic you encounter.
My advice to you is to browse as many boards and topics now, when you are at your beginning. Learn each board's specifics; learn the users which post inside these boards; after a while, when you know what information attracts you the most, learn where to find it inside the forum. When you don't understand something feel free to ask, don't be shy. However, have in mind to not spit words out straight from your stomach. Process the ideas into thoughts; process thoughts into words; combine words into
coherent sentences and phrases; last, not least, write correctly. Follow these steps and, in time, you will learn. But not fast. This can't be done. Yet you'll manage to learn new things everyday.
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