Short answers, pulled from the story.
Operation Bagration launched on the 19th of June 1944 with partisan attacks and concluded by the 27th of July 1944 after the capture of Białystok. The main offensive started early morning on the 22nd of June 1944, and fighting continued until late July when Soviet forces reached their final objectives.
Newer research indicates that around 540,000 German soldiers were killed, missing or wounded during this engagement. Approximately 300,000 men from Army Group Centre were lost between the 22nd of June and the 4th of July 1944 alone.
Soviet forces captured Vitebsk by the 29th of June, Minsk by the 3rd of July, Polotsk by the 4th of July, Šiauliai by the 31st of July, Vilnius by the 13th of July, and Białystok by the 27th of July. These victories allowed the Red Army to recapture vast amounts of Soviet territory and occupy Baltic and Polish territories.
The German High Command expected the next offensive to target Army Group North Ukraine under Field Marshal Walter Model instead of Army Group Centre. They lacked intelligence capabilities to discover true intentions and had redeployed one-third of artillery and half of tank destroyers to the south.
The offensive resulted in the loss of 2,957 tanks, 2,447 artillery pieces, and 822 aircraft for the Axis powers. The destruction included many experienced soldiers, NCOs, and commissioned officers that the Wehrmacht could not replace.