Dear HERO,
If you want any proof-reading, I'll help. Please don't be mad because of the length of the list, and there may be duplicates. You did say encyclopedia.
As for topics, let me tell you that, since I am a middle-aged beginner, I am long on references and short on talent. So, I cross-referenced all my references by computer. Here are some of the "basics" I have collected.
1. Weathering with pastels
2. Airplane battle damage
3. Bases, how to prepare (Celluclay, Durhams, MDF, waterproof styrofoam, etc.)
4. Gluing clear parts
5. Fillers-spackling paste,epoxies,automotive filler,Squadron Green, etc.
6. Filling seams
7. Different glues
8. Planning,layout,staging,perspective
9. Lighting (maybe not a beginners topic)
10. beeswax
11. cleaning parts before assembly
12. putties-VP, Milliput,Dr. Microtools
13. Sources- Micro-mark, Squadron, VLS, Woodland Scenics, etc. etc.
14. working with resin
15. making rubble
16. flattening tires
17. tools- what is needed, how to use
18. how to keep tools from rolling
19. wash new resin with acetone or Blech White
20. constructing buildings
21. kill the styrene shine with wire brush or kitchen cleanser
22. Grandt line for windows, etc.
23. prepping plaster buildings
24. rubble
25. fixing aged decals
26.stucco
27. applying decals
28. storing decals
29. applying dry transfers
30. making custom decals
31. how to make nameplates
32. photographing models and dioramas
33. making tarps and bedrolls
34. pinheads for rivets
35. Gunze 500 for pin holes
36. masking
37. flags from Archer dry transfers
38. differnt paints and thinning for brush or airbrush
39. metal and gunmetal finishes
40. storing paint-blowing before closing,cleaning threads,Vaseline,foil, etc.
41. pegging figures for painting
42. rust
43. using markers for silver,gold or copper
44. building a cheap paintbooth
45. making barbed wire
46. rocks-Durhams, etc.
47. plaster-impregnated guaze
48. bricks-make your own
49. cobblestones-lentils and other methods
50. field grass
51. flyspecking-blowing turf or dirt on a rock wall
52. grass and weeds- Boyd's,FisHair,felt,hemp,theatrical crepe hair,corn silk
53. leaves-spices,silver birch catkin seeds, etc.
54. tree armatures-wood,wire,combo, bottlebrush
55. mud-making and using
56. plaster types and mixing
57. rock molds with latex and guaze
58. trees- wood shungles for pine trees
59. tree armatures-sea foam, sagebrush, tumbleweed, etc.
60. water- how many ways...
61. balsa foam for buildings
62. buckles from milliput
63. casting with Alumilite
64. panty hose for helmet netting
65. Legos for molds
66. E-Z photo etching- Sharpies and p-n-p paper and drawing program
67. converting scales
68. sandbags-epoxy, florists clay, etc.
69. Sculpey uses-and air drying clay uses
70. spectacles
71. sprue stretching
72. bonding styrene, scribe and snap, reinforcing, etc.
73. solder for "gizmology"
74. use of Future (Klear)
75. dry-brushing
Sincerely,
Sealhead

(Kansas Sunflower)