True. You simply enter the data in the field and that's it.
If you have several files that should get the same data, perhaps because they belong to the same album, then select all these files in the files list.
Now enter the correct data in the tag panel in the corresponding fields, e.g. "Pink Floyd" as ARTIST and ALBUMARTIST, "Animals" as ALBUM, 1977 as YEAR, "Electronic" as GENRE.
OK: if you want to modify only a single field in a single file (e.g. TITLE), it may be easiest to do that in the files list:
Navigate to the correct line and column either by mouse or by and .
Enter the date,
And to make matters even more "complicated":
Sometimes it may be necessary to enter data in a field that is currently not displayed, neither in the tag panel nor in the files list: for this purpose, there is also the extended tags dialogue (Alt-T).
In this dialogue, you can either modify existing fields, delete them and/or add new ones.