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Well, look at the definitions of each quantity.... "Molarity"="Moles of solute"/"Volume of solution" "Molality"="Moles of solute"/"Kilograms of solvent" "Molality" is thus independent of temperature, whereas "molarity" changes slightly with temperature as the density of the solution changes. For dilute solutions, "molarity"-="molality". to a very good approximation.
Titration affects molarity by changing the volume of the solution. For example, if you have a 1M solution of NaOH in 1 Liter, then you have 1M Na+ ions. If you titrate this with 1M HCl, then it will take 1 Liter of HCl to fully titrate this. However, your Na+ ion concentration is now 1 mole in 2 liters, or 0.5M. So titrations generally increase volume and reduce molarities