Like they said, yoga is great and you can just look up an endless amount of videos!
But the main thing with mobility is to stay consistent and just keep moving. Use your full ROM.
Shoulders - Bar dislocates
Upper back - thoracic bridge/ lacrosse ball/ foam roller
Hip flexors and quads - kneeling lunge with leg lift (makes sure to posterioraly tilt your pelvis and bring your heel to your glutes)
Hamstrings, calf - Cossack squat (also adductors) downward dog/ bear walk, Jefferson curl
Also a big thing is to build up your core strength as core stability = distal mobility