You should not have to install software or create an account just to make one table. Open this page and start typing into cells.
Click a cell and type a value, or use the bar above to enter a formula beginning with = (for example =SUM(A1:A9)). Drag to select a range and use the fill handle to continue a series down or across. The toolbar sets bold, italic, underline, number format, font size, alignment, merging and wrapping; rows and columns are inserted and removed from the buttons beside it.
Formulas, range selection with copy and paste, undo, autofill, inserting and deleting rows and columns, find and replace, sorting, filtering, frozen panes, resizing, merged cells and wrapped text. Keep several named sheets in one file. Import xlsx, CSV, TSV and ODS files and export in the same formats.
Without an account your sheet is stored in this browser only. Clearing site data or opening it elsewhere loses it and you cannot send it by link, though an exported xlsx or CSV file stays with you. Create a workspace and it is saved on the server so you can continue on another device and share it with your team.