"Practice:"
The "Practice:" space does not exist, so please stop creating pages in it. You are free to use your sandbox (which the Main Page example was created for you at User:QuzvyPX/main page, for example) if you want to practice editing, or use MarioWiki:Sandbox. What's more, the categories you made were also unnecessary, as they don't fall within our policy. 
21:13, July 12, 2020 (EDT)
- I understanded quzvyPX
- This may be a bit picky, but that's not how you sign a comment. You sign it by linking to your userpage like this: QuzvyPX Or you can make a signature page.
Nightwicked Bowser 
- This may be a bit picky, but that's not how you sign a comment. You sign it by linking to your userpage like this: QuzvyPX Or you can make a signature page.
What do you want new Mario & Luigi series name
- 1.Mario & Luigi : Doom of plasma
- 2.Mario & Luigi : Star guardian
- 3.Mario & Luigi : Prometheus
- 4.Other(comments)
Grammar
Please use proper grammar when editing on articles, which means proper capitalisation for names like "mario and luigi" ("Mario and Luigi"). Not doing so may lead to broken links or in worse cases the information being unreadable and leading to your edits simply getting removed. I suggest reading MarioWiki:Manual of Style. 
Mario JC 23:40, July 12, 2020 (EDT)
Gender
There is no "gender" parameter for infoboxes, so if you try to put it in, nothing will show so don't bother with it. Not to mention you even put "male" for Princess Peach's infobox. Nightwicked Bowser
Subpages
Your current subpage User:QuzvyPX/featured article violates MarioWiki:Userspace#What about user subpages?. Please move this content to your main userpage as soon as possible or it will be deleted. Furthermore, if your User:QuzvyPX/main page isn't going to serve any purpose other than being a copy of the official main page, I'm afraid it will have to be deleted as well. If you want to "practise" edits, go to MarioWiki:Sandbox or create a personal one on User:QuzvyPX/sandbox, but it must be used for this purpose or for other wiki-related matters only. Mario JC 07:39, July 26, 2020 (EDT)