Samus Aran's Power Suit is versatile, but mastering its movements is key. Use the D-Pad (or equivalent directional inputs) to move Samus left and right. Press A (or equivalent jump button) to jump. Holding A will allow for a higher jump. To fire your Arm Cannon, press B (or equivalent fire button). You can fire in eight directions by combining movement with the fire button. Remember that Samus can crouch by pressing Down on the D-Pad, which is essential for avoiding certain projectiles and entering small passages later with the Morph Ball. Practice these basic movements in the initial areas to get a feel for Samus's agility.
Metroid
Controls & Movement — Metroid Guide
Master Samus Aran's movements in Metroid with this guide on controls, including jumping, firing the Arm Cannon in eight directions, and mobility.