Divide yourself and put one genome in each part. This is known as cell division, it's the simplest level of development. Some bacteria do little more development than this.
Some bacteria take development one level higher.
Say a bacterium is growing along nicely and it starts to run out of nutrients, like water. Some bacteria, like Bacillus subtilis, are able to form a specialized structure that can withstand a long period of stress. A bacterial cell under nutrient depletion stress will undergo a round of chromosomre replication, But instead of the cell dividing, a spore septum forms Spore septum surrounds the apical chromosome, so two layers of membrane IM space pumped full of tough peptidoglycan. Differential gene expression. You keep all your progeny cells together and allow some to do different things - like you get a migrating slug, with a sporulation structure.