tag files at finder did not work well

I'm not sure that I completely understand your workflow but will try to help.

First, visit Finder settings to modify the available tags to meet your needs:

Finder menu > Settings... > Tags >

1. Click each tag you do not use (i.e. red, green, etc.) and click "-" at the bottom to remove it.
2. Modify/manage the names and colors of the tags that you do use (i.e. "unsort", "cpp", "travel")
3. Enable the check box to the right of each to ensure that your tags appear at the bottom of Finder

Add the Tags column to Finder:

1. Finder menu > View > Show View Options > Show Columns: > Tags

Then, you can select one or more files, and either right-click and modify their tags, or, click the Edit Tags icon at the top of finder to manage the tags applied. You can then sort by tags in two ways:

• In any Finder view: Finder menu > View > Show View Options > click the Sort By pop-up menu, then choose Tags
• In Finder List view: Move the pointer over the Tags column > Click the column name to sort or reverse the sort

More information about using Tags is available here:

Use tags to organize files on Mac - Apple Support

There are only six fixed color tags and a seventh if you want to use the transparent None tag. There is no means for the user to choose their own custom tag color, but one can create custom tag names in the Finder Settings > Tags panel with one of the available tag colors and then make it active ☑︎ for use in the Finder.

One can add one or more of these custom tag names to a single or collection of files. One can insert, change, or remove these tags using the Finder secondary menu item Tags… after right-clicking on a file or selection of files.

I have a PDF on my Desktop that has four tags assigned to it:

If I want to insert a tag, I must use the left or right arrow key to position the insertion point in front of the tag where I want the new tag inserted. If I want to remove one (or more tags), I position the insertion point behind that tag and press backspace. Should I want to replace a given tag, I simply click on it and choose a different tag to overwrite its position in the tag list. Follow these changes with a return key before clicking Esc to dismiss the panel.

Tested: macOS Tahoe 26.2

Not sure if this is the issue, but if you use the “customize” folder to change the color, it does that by adding a colored Tag.

i dont want the system to create red blue … tags just sorted as i like

You may not understand that we don’t know why yours is doing that. All we can do is guess as to what might be causing the issue that we don’t have.