Saving a day's play on Grand Theft Auto

Grand Theft Auto 5 refuses to save my game automatically. After each play, on load it reverts to the start. I am not an experianced gamer. Please help as I cannot keep starting from the beginning. Thanks

There's three ways to save the game. You can save through the start menu. You can save at a safe house if you have one unlocked. The game should autosave after completing a mission, as long as you don't have autosave turned off.

Grand Theft Auto 5 refuses to save my game automatically.

You can head down to Pause Menu > Settings > Saving/Saving and Startup and check that Autosave is enabled.

PS3 & Xbox 360:

PS4, Xbox One and PC:

Even if the auto save didn't work, you can quick save after a mission by using the phone:

Or by sleeping on one of the beds:

After that you will have to choose a save space, you can either create a new one or overwrite an existing save:

After that the current game state will be saved and the progress should stay intact, but remember to save the game constantly!