If you are an atheist or there is no sign of your spiritual path in your profile, do not answer here.
So to the question.
1: As a religioues or spiritual person, what do you see as the most important in the teaching you follow/cultivate? Or maybe all of it is important for your spiritual development?
As a Christian, the most important teaching is to love; love God and love your fellowman. And Christ is the epitome of love - giving his life for the sake of others.
2: do you feel you have obtained wisdom that you did not have before? Would you be able to say something about this wisdom?
Most definitely. I've very much enjoyed my theological journey to this point and look forward to what the future brings. My views have undergone a significant shift overtime, so it's hard to try to say something about everything. But, in the vein of the last answer, I will speak of Christian morality and of justice. We all (hopefully) know that justice is a good and necessary thing. Justice is certainly an important topic in scripture. However, it is also clear that there are varying degrees of what is good and acceptable - and Justice is NOT in the highest tier, and should not be our first approach to problems. Rather, it is far more desirable that people repent, change their ways, and be forgiven than to face justice. Those that thirst for "justice" first and foremost and who lack compassion are not acting in accordance with God's will.
James 2:13 Because judgment without mercy will be shown to anyone who has not been merciful.
Mercy triumphs over judgment
So first and foremost we should try to show mercy and love, talk through conflicts and attempt to make them right without any need for talk of justice. If that is enough to reach people that is best.
If we can't reach people by talking to them, and if their offense merits it, then we turn to the Justice System to resolve our conflicts and hopefully reach a wise and just conclusion to the matter.
If our Justice System fails, then things start to head south real fast and things may escalate into violent confrontations and even war (as we see now with our police in this country). War is undesirable but can be a necessity if things have truly fallen this far. Society can't function or exist without basic trust and respect between people and the authorities, not for long anyways.
3: do you see the teaching as something that grows within you?
Definitely. The idea that there is a hierarchy of what is good, and what that hierarchy is, isn't something at the forefront of the scriptures or Christian teachings for the most part. It's there, of course, just not front and center. It's not something I've ever heard in a service growing up either. I think this is a shame, as without it there are seeming contradictions, such as between the goods of Mercy and Justice. It also helps to demonstrate the higher calling that Christians are called (self-sacrifice for the sake of others) to vs basic worldly morality (eye for an eye).
We also see this hierarchy in more specific issues, like marriage. Scripture teaches that the best thing for a Christian is to remain unmarried so that they may fully dedicate themselves to God. The next best thing, if you can't handle being alone, is to marry one other fellow believer. While there's nothing inherently wrong with a man marrying multiple women from a scriptural perspective, more women (even fellow believers) means less focus on God and doing his work. If you married a woman before converting then you are encouraged to remain with her, but it is least acceptable as a believer to go seeking out a non-believing wife - because she'll have her own beliefs and will encourage you to adopt them.