Google pgn files (Portable Game Notation)
This is a text file with script like formatting.
There are databases with hundreds of games,
that are easily downloaded.
There are many viewers, for eg 'The Tarrasch',
which is a free download, is a good start point to play these files.
Later use ChessBase, which is the industry standard.
It has many features to annotate the games,
search databases, look at opening book etc.