How do I… · Excel
Freezing keeps headers visible while the rest of the sheet scrolls. The trick nobody explains is that Excel freezes everything above and to the left of the cell you have selected.
B3 — then View → Freeze Panes → Freeze Panes.A thin grey line shows where the freeze is. If it appears in the wrong place, you had the wrong cell selected — unfreeze, reselect, freeze again. Freezing is saved with the workbook, so everyone who opens it gets the same view. In Google Sheets the same thing lives under View → Freeze.
Faster than searching: box the part of your screen you cannot work out and ask about it directly — in Excel or anywhere else. Answers arrive where you drew the box.