Short answers, pulled from the story.
The first recorded raid occurred at Portland, Dorset in 789 when three ships from Hordaland landed. They killed Beaduheard, the royal reeve from Dorchester who tried to identify foreign merchants.
The monastery at Lindisfarne off the northeast coast of England was sacked on the 8th of June 793. This event marked one of the last major raids on England for about forty years before Vikings shifted focus to Ireland and Scotland.
A group of previously uncoordinated bands of predominantly Danish Vikings joined to form a large army known as the Great Heathen Army led by Ivar the Boneless and Halfdan Ragnarsson. The army crossed the Midlands into Northumbria capturing York in 866.
A treaty agreed upon after the Battle of Edington in May 878 set lasting peace terms between the two kings including boundaries of each kingdom. Known as Treaty of Alfred and Guthrum it survives in Old English in Corpus Christi College Cambridge Manuscript 383.
Harald Hardrada king of Norway led invasion of England in 1066 with 300 longships and 10,000 soldiers attempting seize English throne during succession dispute after death Edward Confessor. His defeat at Battle of Stamford Bridge is described as end of Viking Age Britain.