All numbers in Excel are actually decimal values (stored at the lowest level). The default is a best guess of how you typed it. Dates, numbers, etc. Remember - The format doesn't mean much of anything.. what's stored there remains the same.
general format
A number typed in a cell has no formatting of its own. Formatting is determined by the format set for the cell. You may be asking about conditional formatting, but it is difficult to tell from your question.
format as you type
A label is usually text or it could be a number in a text format, such as having a year as a heading. For text it is typed in normally, and for numbers we put the single quote before it, so Excel does not treat it as being a number.
format
Format as you type
format as you type
The default alignment for text is left aligned. You can centre the text after it is entered. You can also set the formatting to be centred before entering anything. Then when text is typed into the cell it will be centred.
yes
Numbers are aligned to the right in a cell by default.
a typed letter in Microsoft word
If there is something in the cell, it will be overwritten by what is being typed in.
The thing you have typed will be entered into a cell. It may format it if the cell has pre-defined formatting. The cursor will move to the next cell below the cell you are entering something into.