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You're going to be a bit more specific :) Shoot me a DM on discord "mind_at_large" if you need some pointers.

what you exactly mean by custom? by making a map for hl2 or custom models and textures? you can always learn from TopHATTwaffle hamemr videos or 3kliksphilip. To go beyond you gotta dig more around it since I don't know much on models/textures.