There are many audio and video tutorials on it, which are free to download, more vivid and easier to learn. I believe it will bring you many surprises, because I downloaded many English learning resources on it. It feels good. There should be something you need.
Moreover, there are free network disks, which can collect, save and bank the information you need. It is a pretty good network disk in China. Now there is 3G free storage space, and you can exchange points for space. My storage space has been upgraded to 6G now, so I can continue to exchange more points for space.
The file is saved permanently. For free users of 3G, the upload limit of a single file is1100mm. If you upgrade to 5G, the upload limit of a single file is 200M, so the performance is relatively stable and the upload and download speed is relatively fast. You can share your resources with your friends or express your documents to your friends.