in minecraft there 3 game modes that can be accessed by creating a new game in java those 3 are survival, creative, and hardcore there are 2 in bedrock they are survival and creative. in creative you have access to all the blocks but a few witch you have to use commands to obtain. in survival you have to search and find all the blocks some are more rare than others. java also has 2 extra game modes witch you have to use commands to get into they are spectator and adventure. bedrock has 1 extra game mode it is adventure if you have OP you can just go in to the menu and click adventure mode.