Walk into a gym and you will see hundreds of exercises. You do not need most of them. Nearly every useful beginner exercise is a version of one of a few basic movements: you squat, you hinge (bend at the hips, like picking a box off the floor), you push, you pull, and you brace your core. Pushing and pulling each come in two directions: away from or toward your chest, and overhead or down from overhead.
That gives a short checklist: squat, hinge, horizontal push, vertical push, horizontal pull, vertical pull and core. If a session has something for each, you have trained most of the big muscles without thinking about individual muscles at all.
Most people who start on their own pick what they enjoy. That usually means a lot of chest and arms and very little pulling, hinging or core. Muscles on both sides of a joint then get very different amounts of work, and your shoulders and lower back end up doing more than their share. Common guidelines for adults suggest training all the major muscle groups on at least two days a week, and a movement-pattern checklist is an easy way to make sure none is left out.
It also keeps things simple. One exercise per pattern is plenty for a first session. Two or three sets of each fits in 40 to 50 minutes.
Tap exercises to add them. 0 chosen.
A single exercise can cover two patterns. A push-up is mainly a forward push, but your trunk works to keep you straight, so it also counts towards core. A kettlebell swing and a Romanian deadlift both train the hinge; you only need one of them in a session.
The empty bars are the ones to fix first. Beginners most often have gaps in the hinge, the pulls and the core. Fill those before adding a second chest exercise. Single-joint moves like curls and lateral raises are fine as extras, but they sit on top of the seven patterns, not in place of them.
Because the patterns matter more than the exact exercise, you can swap freely within one. If the leg press machine is busy, a goblet squat covers the same pattern. If your wrists dislike push-ups, a chest press machine does the job. Keep one exercise in each pattern for several weeks so you can add reps and weight, then change one at a time.
If an exercise hurts in a joint, or you have an injury or a medical condition, check with a doctor or physiotherapist before training it. A swap that feels fine is always better than pushing through pain.
This is a starting checklist for general strength training. It is not a rehab plan, and it does not replace advice from a coach if you are training for a particular sport.