Windows 10 has multiple ways to save files, name files, and search. This adds complexity and you are not alone in struggling to figure it all out.
When you save a document, and use the option "Save" or "Save As", do you intentionally change from the default location or just provide a name for the file?
If not changing the location, Windows is probably saving your files in a "Documents" folder. This is a typical "default" setting.
As to searching, how are you doing this?
One way of searching is to use the search tool (looking glass icon) that pops up in the lower left corner of your screen. When you click on this tool, you'll see a pop-up. On the top of the pop-up window, there is a tab labeled "Documents". Try searching there if you aren't already doing this.
If you are unfamiliar with the File Explorer program, I think it is the best tool for locating files and in general, to understand how files are organized in your PC. I think anyone new to Windows will find this program useful as it provides a "map" for all the folders and files on your computer.
You may benefit by watching a YouTube video tutorial about how to use the Windows File System and/or the File Explorer program.
I'm happy to try and help once you spell out a few more details.
Mike
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