First of all, choose a trustworthy brand organization or a local one with more strength. Generally, there will be no problem with the signed agreement. After all, they themselves have been audited by the legal department, otherwise they will leave an excuse.

Moreover, training and learning mainly depend on ourselves. After all, everyone's ability to accept learning is different. There will be good and bad studies in a class. Signing an agreement can only be a guarantee. If you learn well by yourself, you don't need any agreement, but if you learn very generally, even if there is an agreement, it will certainly not be of much use.