diff --git a/src/main/java/me/night/nullvalkyrie/Main.java b/src/main/java/me/night/nullvalkyrie/Main.java
index 79a0c9b..94fdc31 100644
--- a/src/main/java/me/night/nullvalkyrie/Main.java
+++ b/src/main/java/me/night/nullvalkyrie/Main.java
@@ -1,6 +1,5 @@
 package me.night.nullvalkyrie;
 
-import com.mongodb.client.MongoDatabase;
 import io.github.cdimascio.dotenv.Dotenv;
 import me.night.nullvalkyrie.events.listeners.*;
 import me.night.nullvalkyrie.tasks.AlwaysDayTask;
@@ -18,7 +17,6 @@ import org.bukkit.plugin.java.JavaPlugin;
 
 public final class Main extends JavaPlugin {
     public static Dotenv env;
-    public static MongoDatabase database;
 
     @Override
     public void onEnable() {
diff --git a/src/main/java/me/night/nullvalkyrie/commands/Command.java b/src/main/java/me/night/nullvalkyrie/commands/Command.java
index 328a61d..04f43b6 100644
--- a/src/main/java/me/night/nullvalkyrie/commands/Command.java
+++ b/src/main/java/me/night/nullvalkyrie/commands/Command.java
@@ -4,6 +4,7 @@ import org.bukkit.Bukkit;
 import org.bukkit.command.CommandMap;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.defaults.BukkitCommand;
+import org.jetbrains.annotations.NotNull;
 
 import java.lang.reflect.Field;
 import java.util.Arrays;
@@ -29,13 +30,13 @@ public abstract class Command extends BukkitCommand {
     }
 
     @Override
-    public boolean execute(CommandSender sender, String commandLabel, String[] args) {
+    public boolean execute(@NotNull CommandSender sender, @NotNull String commandLabel, String[] args) {
         onCommand(sender, args);
         return false;
     }
 
     @Override
-    public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
+    public @NotNull List<String> tabComplete(@NotNull CommandSender sender, @NotNull String alias, String[] args) throws IllegalArgumentException {
         return onTabComplete(sender, args);
     }
 
diff --git a/src/main/java/me/night/nullvalkyrie/entities/holograms/PerPlayerHologram.java b/src/main/java/me/night/nullvalkyrie/entities/holograms/PerPlayerHologram.java
index 04b63a7..4bfc98a 100644
--- a/src/main/java/me/night/nullvalkyrie/entities/holograms/PerPlayerHologram.java
+++ b/src/main/java/me/night/nullvalkyrie/entities/holograms/PerPlayerHologram.java
@@ -23,16 +23,15 @@ public class PerPlayerHologram {
         }
     }
     private void spawnLine(double y, Player player, String line) {
-        EntityPlayer splayer = ((CraftPlayer) player).getHandle();
-        EntityArmorStand stand = new EntityArmorStand(splayer.s, player.getLocation().getX(), y, player.getLocation().getZ()); // creating armor stand by location and s(stands for nms world)
-        stand.j(true); // set invisible
-        PlayerConnection connection = splayer.b; //connection
-        connection.a(new PacketPlayOutSpawnEntity(stand)); // sending packet to spawn the armor stand
-        DataWatcher watcher = stand.ai(); // ai = getDataWatcher
-        Optional<IChatBaseComponent> optional = Optional.of(IChatBaseComponent.a(line)); //according to wiki.vg, setting the custom name requires Optional<ChatComponent> if you are using mojang mappings, however i cant find out what a stands for, just find a method that returns ChatComponent which takes string as a parameter
-        watcher.b(new DataWatcherObject<>(2, DataWatcherRegistry.f), optional); // f = ChatComponent, here we putting the optional<ChatComponent> into the datawatcher
-        watcher.b(new DataWatcherObject<>(3, DataWatcherRegistry.i), true); // i = boolean, we setting show custom name to true
-        // watcher.b = set
-        connection.a(new PacketPlayOutEntityMetadata(stand.ae(), watcher, true)); // sending packet to update the metadata, ae=getEntityId
+        EntityPlayer p = ((CraftPlayer) player).getHandle();
+        EntityArmorStand stand = new EntityArmorStand(p.s, player.getLocation().getX(), y, player.getLocation().getZ());
+        stand.j(true);
+        PlayerConnection connection = p.b;
+        connection.a(new PacketPlayOutSpawnEntity(stand));
+        DataWatcher watcher = stand.ai();
+        Optional<IChatBaseComponent> optional = Optional.of(IChatBaseComponent.a(line));
+        watcher.b(new DataWatcherObject<>(2, DataWatcherRegistry.f), optional);
+        watcher.b(new DataWatcherObject<>(3, DataWatcherRegistry.i), true);
+        connection.a(new PacketPlayOutEntityMetadata(stand.ae(), watcher, true));
     }
 }
diff --git a/src/main/java/me/night/nullvalkyrie/ui/inventory/InventoryListener.java b/src/main/java/me/night/nullvalkyrie/ui/inventory/InventoryListener.java
index dc09eae..b00f89f 100644
--- a/src/main/java/me/night/nullvalkyrie/ui/inventory/InventoryListener.java
+++ b/src/main/java/me/night/nullvalkyrie/ui/inventory/InventoryListener.java
@@ -18,7 +18,7 @@ import java.util.Collections;
 import java.util.List;
 
 public class InventoryListener implements Listener {
-    RandomCollection<String> randomCollection;
+    private final RandomCollection<String> randomCollection;
     public InventoryListener() {
         randomCollection = new RandomCollection<>();
         for (Items e : Items.values()) {
diff --git a/src/main/java/me/night/nullvalkyrie/ui/inventory/Miner.java b/src/main/java/me/night/nullvalkyrie/ui/inventory/Miner.java
index 7b68196..ccdd6a8 100644
--- a/src/main/java/me/night/nullvalkyrie/ui/inventory/Miner.java
+++ b/src/main/java/me/night/nullvalkyrie/ui/inventory/Miner.java
@@ -14,7 +14,7 @@ import java.util.Date;
 import java.util.List;
 
 public class Miner extends GUIManager {
-    public static String title = ChatColor.DARK_AQUA + "Crypto Miners";
+    public static final String title = ChatColor.DARK_AQUA + "Crypto Miners";
     @Override
     public void UI(Player player) {
         init(45, title);
diff --git a/src/main/java/me/night/nullvalkyrie/ui/player/SideBarManager.java b/src/main/java/me/night/nullvalkyrie/ui/player/SideBarManager.java
index 183d58b..9442b0e 100644
--- a/src/main/java/me/night/nullvalkyrie/ui/player/SideBarManager.java
+++ b/src/main/java/me/night/nullvalkyrie/ui/player/SideBarManager.java
@@ -7,7 +7,6 @@ import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.entity.Player;
 import org.bukkit.scoreboard.*;
-import org.bukkit.scoreboard.Scoreboard;
 
 import java.util.UUID;