sering terjadi erorr dan selalu muncul disetiap halaman web

sore teman2 forum maklum baru belajar , awam banget

copy paste kode orang lain .. pas dicoba di edit untuk belajar .. erorr terus dengan perihal yang sama .. disetiap halaman webnya juga selalu muncul .. mohon pengarahannya .. tks

Warning: mysqli_query() expects at least 2 parameters, 1 given in C:\xampp\htdocs\tourtravel\beranda.php on line 11

Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, null given in C:\xampp\htdocs\tourtravel\beranda.php on line 12

 <?php
include "config/koneksi.php";
?>

<div class="container">
	<div class="grid">
		<div class="row">
            <div class="border padding20 span10" style="background-color: #F5F5F5;">
				<div class="panel no-border">
					<?php
						$comot = mysqli_query("SELECT * FROM setup_dasboard ORDER BY id_dasboard DESC LIMIT 3");
						while($ngisi=	mysqli_fetch_array($comot)){
					?>
                    <div class="panel-header ribbed-amber fg-white"><strong><?php echo $ngisi['nama']; ?></strong></div>
                    <div class="panel-content fg-dark nlp nrp">
						<?php
							if ($ngisi['gambar']!=""){ ?>
						<img src="images/<?php echo $ngisi['gambar']; ?>" class="place-right margin10 nlm ntm size3">
						<?php	}?>

						<?php echo $ngisi['konten'];?>
                    </div>
					<?php
						}
					?>
				</div>

            </div>
			<div class="padding20 span4" style="background-color: #F1F1F1;">
				<div class="panel no-border">
                    <div class="panel-header ribbed-cyan fg-white">Waktu Sekarang</div>
                    <div class="panel-content fg-dark nlp nrp">
						<center><div class="calendar" data-role="calendar"></div></center> <br />
						<div class="times" data-role="times" data-style-background="bg-lightBlue" data-style-divider="fg-lightBlue"></div>
                    </div>
				</div>

				<div class="panel no-border">
                    <div class="panel-header ribbed-cyan fg-white">Komentar</div>
                    <div class="panel-content fg-dark nlp nrp">
						<div id="komenList" class="border" data-role="scrollbox" data-scroll="vertical">
						<?php
						$comot_komen = mysqli_query("SELECT * FROM komentar ORDER BY id_komentar DESC LIMIT 5");
						while($ngisi_komen = mysqli_fetch_array($ngisi,$comot_komen)){
							$thn=substr($ngisi_komen['waktu'],0,4);
							$bln=substr($ngisi_komen['waktu'],5,2);
							$tgl=substr($ngisi_komen['waktu'],8,2);
							$jam=substr($ngisi_komen['waktu'],11,8);
							if($bln==1){ $x="Jan"; }
							else if($bln==2){ $x="Feb";	}
							else if($bln==3){ $x="Mar"; }
							else if($bln==4){ $x="Apr"; }
							else if($bln==5){ $x="Mei"; }
							else if($bln==6){ $x="Jun"; }
							else if($bln==7){ $x="Jul"; }
							else if($bln==8){ $x="Agu"; }
							else if($bln==9){ $x="Sep"; }
							else if($bln==10){ $x="Okt"; }
							else if($bln==11){ $x="Nov"; }
							else{ $x="Des"; }
							echo "<p class='text-info'><strong>".$ngisi_komen['nama']."</strong> <em>says</em>  :";
							echo "<br><small>".$jam.", ".$tgl." ".$x." ".$thn."</small></p>";
							echo "<p class='tertiary-text-secondary'><em>".$ngisi_komen['komentar']."</em></p>";
							echo "<br />";
						}
						?>
						</div>
						<script>
							$(function(){
								$("#komenList").scrollbar({
									height: 300,
									axis: 'y'
								});
							});
						</script>
						<form method="POST" action="kirimKomentar.php">
							<fieldset>
								<div class="input-control text" data-role="input-control">
									<input type="text" name="nama" required placeholder="Input Nama:" >
									<button class="btn-clear" tabindex="-1"></button>
								</div>
								<div class="input-control textarea" data-role="input-control" placeholder="Tuliskan komntar disini!">
									<textarea name="komentar" rows=3></textarea>
								</div>
								<input name="Tambah" type="submit" value="Kirim" class="bg-dark fg-white" data-hint="Silahkan tinggalkan komentar">
							</fieldset>
						</form>
                    </div>
				</div>

				<div class="panel no-border">
                    <div class="panel-header ribbed-cyan fg-white">Slider</div>
                    <div class="panel-content fg-dark nlp nrp">
						<div class="tile double live" data-role="live-tile">
							<div class="tile-content image">
								<img src="images/galeri/harau4.jpg" class="cover1" />
							</div>
							<div class="tile-content image">
								<img src="images/galeri/harau5.jpg" class="cover1" />
							</div>
							<div class="tile-content image">
								<img src="images/galeri/sianok4.jpg" class="cover1"/>
							</div>
							<div class="tile-content image">
								<img src="images/galeri/jam gadang1.jpg" class="cover1" />
							</div>
                        </div>
                    </div>
				</div>

            </div>
		</div>
	</div>
</div>