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In order to keep your NPCs safe, I'd suggest you build an arena far away from them, where you will fight bosses and invasions.
Although the blocks themselves will not be destroyed, they will get contaminated by hollow and crimson/corrupt whilst they spread.
So assuming your "base" means the NPC houses and one or two plant gardens or artificial biomes like a above ground glowing mushroom area, to "protect" it from hardmode contamination is;
a) Dig a 5 block wide hole around the area, including the both sides and up and down. This alone should work but because hardmode contamination biomes grow crystals that can extend for 3-4 blocks which means they can contaminate without touch. There may be areas where this isnt applicable so the next one fixes that.
b) for safety outline border areas with Gray Brick. This is the contamination immune block I know of. I think glass works too but this only uses stone to produce so I prefer this. I think your original question refered to this but you didnt know what exatly it protected you from.
Good luck, it really isnt hard because you are not in expert, just different enemies and biomes.
Basically, yeah
Corruption and crimson can spread over a gap of up to 3-4 blocks with the thorns, so I would advice you to make a 4 wide hole to hell and fill it with something like glass, wood, stone bricks
2. There are 2 biomes that spread. Corruption or Crimson is the one you already have before hard mode. And hollow is the new one. The problem is if they come and contaminate your starting area, it stops being jungle and instead becomes a new biome so enemy spawns, what plants grow, visual look and background also changes. To keep thing the same we isolate them with this method.