I have compiled a bunch of threads, tutorials and videos that you might find useful. Note some of this might be complex. I know Egan already made this but there are some useful things (in my eyes) that he didn't have in the thread particularly Idolon's and Fishbus' videos. Overall:The Hows and Whys of Level Design - Sjoerd “Hourences” De Jong Development Process:Shoreleave [Playlist] - [UEAK] Crash Trenchfoot [Playlist] - [UEAK] Crash Glassworks [Playlist] - [UEAK] Crash TF2 Mapping Commentary - TF2Maps Winter 2015 72hr Contest Recap/ Timelapse [plr_split] - [UEAK] Crash TF2 Mapping Commentary - TF2Maps 2014 Winter 72 Hour Contest Recap [pl_subzero] - [UEAK] Crash [ARTICLE] Snowplow and the tricks we used to create the Largest map in TF2 - Fr0Z3nR Mangy's Frontier Essay - MangyCarface The Dev Process: Creating MVM Steep - Idolon The Dev Process: Creating KOTH Anthem - tyler ctf converge - Aaron ‘Psy’ Garcha Devlog - koth_synthetic [Playlist] - MegapiemanPHD [Article] 5CP, Competing Against Badlands - grazr From Scratch: Designing a Team Fortress Level - Bobby Ross Post Mortem: CTF_Eden - Jethro Jongeneel Level Design in TF2 (Part 2) - Uncuepa Layout:[GUIDE] Scale and your map. - grazr [GUIDE] Balance, layout and your A/D map. - grazr [GUIDE] Asymmetrical Map Design Dynamics - Idolon [GUIDE] Objectives and Your Map - grazr Player Destruction Guide - Egan [GUIDE] Let's talk about Mann vs Machine. - tyler Use of Open Areas, "Calm Spots," and Other Mapping Advice - Nicky Optimization:Half-Life 2 Map Editing Optimization Guide - Ralph 'zombie@computer' van Hoorn Source SDK Tutorial - Optimizing - 3kliksphillip Logic:[Guide] Payload's Logic - Blade x64 Hammer:Timesaving: Hammer's shortcuts. - YM [GUIDE] Creating backups on compile - Idolon Instances and you - Idolon Angled Geometry in Source - Ian 'Idolon' Spadin [GUIDE] Using Manifests to Make Your Life Better - tyler Hammer Tutorial: Circular brushwork tunnel - Ian 'Idolon' Spadin Creating Modular Curved Structures with Zero Floating Point Precision Loss - iiboharz Detail:[Article] Stairs and your map. - grazr [ARTICLE] Roofs, Skybox brushes and your map. - grazr [Tutorial] Eliminating Dark Rooms - grazr [Guide] Composition and you - Idolon [Guide]Displacements - Basic Construction (Part 1) - Freyja / Aly [Guide] Seamless 3D Skyboxes - Freyja / Aly Art Pass Contest Entries - contains entries for the Art Pass Contest Making A Team Fortress 2 Map Overlay Poster - Fishbus [Tutorial] Making a Poster Overlay - Nineaxis [Tutorial] How to Make a Brick/Rubble Pile - BigfootBeto Zoos and Prefabs:Brushwork Library (WIP) - wareya Frontline Props Placeholders Library - BigfootBeto pl_tapline's "Tap-To-Push" mechanics - GuttyKreum [Prefab] Bumper Karts - ThiqzMod Testing & Feedback:[GUIDE] Uploading your Map, Using VBot, and Finding Feedback - Startacker! [Tutorial] How to Get Your Map Tested - Tarry H Sruman Misc / General Tips:Mapper Interview - Freyja - [UEAK] Crash KotH travel times - Jeff Magnum [TIP] Ask yourself these questions before your next release - sevin [TIP] How to compress .bsp to .bz2 with 7zip - Fr0Z3nR How to install content packs or other custom content - Yrr How to use tf_generic_bomb - [UEAK]Crash (Tutorial) Decompiling maps with BSPsource - Berry [TIP] Taking Isometric Screenshots - phi Tidbits: Will continually update to to include more.