Esports glossary for beginners: understanding LoL, CS2 and Valorant

Let's start with the basics that apply across all games. A BO1 (best of one) is a single-game match, a BO3 is played as the best of three games and a BO5 as the best of five — the longer the format, the rarer the upsets. The seed is a team's ranking going into a tournament, which determines its place in the bracket, meaning the tournament tree. The playoffs are the final elimination stage, after the regular season or the group stage.

The roster is a team's lineup: its five starters, plus any substitutes. The meta (short for "metagame") refers to the set of dominant strategies, characters or weapons at a given moment — and it changes with every patch, the game updates that rebalance the forces in play. Understanding the current meta is one of the keys to gauging the difficulty of a prediction.

In LoL, everything starts with the draft, the pick/ban phase where each team chooses its champions and denies others to the opponent — a won draft is often a match half won. The jungler is the player who roams between the lanes, in the jungle, and whose job is to help teammates through ganks: surprise attacks on a lane to gain an advantage. The split push involves pushing a side lane while the rest of the team occupies the opponent elsewhere, forcing impossible decisions.

On the objective side, Baron Nashor is the most important neutral monster on the map: killing it grants a powerful buff to the whole team, often decisive for closing out a game. When you hear that a team is "playing around Baron" late in a game, it means the match can swing on a single fight.

In Counter-Strike 2, the map pool is the set of maps playable in competition, and the veto is the phase where each team bans and picks maps before the match — a crucial strategic moment for understanding a matchup. Each round pits the CT side (counter-terrorists, on defense) against the T side (terrorists, on attack), and the teams swap sides at halftime. The eco round is a round where a team buys little equipment to save up and come back stronger the next round: losing a round to an opposing eco is one of the worst scenarios in the game.

On the roles side, the entry fragger is the player who goes in first on a site to create the opening, often at the cost of their virtual life. And the clutch refers to winning a round while outnumbered — a 1v3 won in the final seconds is the kind of moment that swings an entire map and makes a match impossible to predict on paper.

Valorant takes the Counter-Strike structure and adds agents, characters with unique abilities split into roles: duelists are the attackers tasked with opening sites, initiators set up site takes with their information and flashes, controllers block vision with their smokes, and sentinels lock down the defense. The IGL (in-game leader) is the team's strategist, the one making the tactical calls mid-match — their influence on a result is often underestimated by beginners.

The spike is the equivalent of the CS2 bomb: the attack has to plant it on a site, the defense has to prevent that or defuse it. A retake refers to the defense reclaiming a site after the spike has been planted, one of the tensest and most spectacular situations in competitive play.

On GoodCall, the call (or prediction) is your forecast on a match's result: winner or exact score, to be locked in before the deadline. Every match displays a difficulty, computed from the context of the matchup: the more uncertain a match is, the higher the multiplier applied to your points — so getting a nail-biter right earns far more than ticking a heavy favorite. The points you accumulate feed your ranking, whether global or within your private leagues with friends.

Finally, the streak refers to a run of correct predictions: keeping one alive over several matches is one of the best ways to climb the ranking, and one of the most satisfying challenges in the game. With this glossary in your pocket, you have everything you need to follow a LoL, CS2 or Valorant match and understand the casters — and to make your first calls on GoodCall, for free and with no real money.