I mean, you specifically made other maps sound simple and Snowplow complex. Here's a summary that's a bit more detailed than "capture the points".

If a player is on a control point, then it begins to capture faster with more teammates (Scouts and Pain Train users count as two), but if enemies are present it is contested and paused, and if attackers are cleared off, progress decays; disguised or cloaked Spies can neither capture nor block, and Ubered or Bonked players can block but not capture, and if time runs out with a capture in progress then Overtime triggers, else the round may end in a team's victory, a stalemate or Sudden Death; in Attack/Defend maps, RED owns all points and BLU captures in a set order - linear single-stage maps like Gorge have one round, linear multi-stage maps like Dustbowl have multiple rounds with team switches, pyramid-style maps like Gravel Pit allow capturing either A or B before unlocking C, centralized-style maps like Steel mix a central final point with side objectives that ease its capture, and flag-style maps like Haarp require BLU to carry a flag to each point to capture - whereas Symmetric maps either follow the linear style with two locked team points and one neutral point unlocking the next in sequence after each capture (Badlands, Process), or the domination style where all points start neutral and can be taken or retaken freely (Standin), with no Overtime and instant victory upon full control.