Shieldaig Oloroso Cask Finish is a single malt Scotch whisky finished in casks that previously held Oloroso sherry. That style of finishing is widely associated with adding richer notes of dried fruit, nuts, spice, and a fuller sense of sweetness to the whisky.
For a novice drinker, this is best understood as a sherry-influenced single malt with a rounder, darker profile than a lighter ex-bourbon-led style. Expect the cask finish to emphasize richness and warmth rather than smoke.