N00b questions

Thanks for your help

0 8995 192.168.1.53 nuc-8i
1 5334 192.168.1.72 galaxy-note
2 3350 192.168.2.14 iphone
3 2726 192.168.1.10 media-center
4 1930 192.168.1.17 smartthings
5 1877 127.0.0.1 pihole
6 1646 192.168.1.56 security-server
7 1397 192.168.1.60 minixtec
8 826 192.168.1.159 
9 784 192.168.2.47 nvidia
10 614 192.168.2.36 
11 613 192.168.1.207 
12 603 192.168.1.77 chromecast
13 601 192.168.1.74 roku
14 590 192.168.2.49 
15 587 192.168.1.15 
16 587 192.168.1.58 
17 576 192.168.2.39 
18 576 192.168.2.40 
19 576 192.168.2.6 
20 427 192.168.1.21 
21 391 192.168.1.61 android
22 284 192.168.2.13 
23 275 192.168.2.17 
24 268 192.168.1.20 nest
25 261 192.168.1.156 
26 228 192.168.2.50 
27 174 192.168.1.6 nest
28 92 192.168.2.15 
29 63 192.168.2.21 lg
30 54 192.168.1.11 
31 40 192.168.1.68 
32 26 192.168.2.19 
33 15 192.168.1.19 
34 14 192.168.2.33 
35 6 192.168.2.46 hd
36 4 192.168.2.16 luxtron
37 2 192.168.1.75 
38 2 192.168.2.26 
39 2 192.168.2.7 
40 1 192.168.2.22 
41 1 192.168.2.27 
42 1 192.168.1.76 
43 1 192.168.2.25 
44 1 192.168.2.24 
45 1 192.168.2.11 lg
46 1 192.168.1.185 
47 0 192.168.2.31 
48 0 192.168.1.8 
49 0 192.168.1.66 
---EOM---

Debug Log: https://tricorder.pi-hole.net/olycqcnx6t