Metroid Dread will throw many enemies, mini-bosses, and bosses at Samus and the player. They will need to use a mix of the abilities acquired through the game and their skill to defeat them. One mini-boss that you will encounter multiple times is the Chozo Soldier.
This boss is different from the Robot Chozo you battled previously in Ferenia and Ghavoran so you will need a different strategy. The Chozo Soldier uses speed as well as both melee and ranged attacks. Overall the Chozo Soldier isn't a difficult fight if you move and attack properly.
The Chozo Soldier will lunge at Samus with its lance. You can dodge this by jumping over the Chozo Soldier. Using the Flash Shift ability works well to avoid this attack. Occasionally, the Chozo Soldier will leap on the wall and then try and slam down on Samus with its lance. You should easily be able to dodge this.
After dealing enough damage—you can use your beam attack uncharged, the Chozo Soldier will enter its second phase. It will become a little faster but in addition to that, when it slams on the ground it will send out black goo. Make sure you time your time to avoid these.
Continue blasting the Chozo Soldier and a cutscene will play. You will have to time two parries to defeat the soldier. The timing isn't too bad for these but if you miss them just blast the Chozo Soldier until the cutscene plays again.
For more information on Metroid Dread, check out How to unlock the Super Missile in Metroid Dread and How to get the Gravity Suit early in Metroid Dread – Sequence Breaking on Pro Game Guides.