Orbital Tactics/Orbital Command/Orbital Combat puts players into the command seat of a space navy spanning across the solar system. The technology of this navy ranges from the near-future to centuries out, and the strategies required for victory will depend on the technology.
In near-future, warships travel less 2-3x faster than what is currently available. Earth-Mars transits varies from a few months to a few weeks. Combat distance is dependent on the weapon technology: lasers are effective up to .5-3 light-seconds, depending on the size and type of the laser. Torpedoes can engage arbitrarily long distances within their dV capabilities, but rules of engagement typically dictate in the range of light-minutes, or a week of travel time. War will not be full-blown head-on, and ships will be detected as soon as they reach their transfer orbits. Thus, it will be a game of force-projection, establishing blockades and stacking military might to favor minimal loses in an eventual engagement. It could even be a cold war style where any act of aggression could lead to major catastrophe for all parties. Because of this, diplomacy will be needed to reduce mutual losses.
Further out into the future, ships can travel an order of magnitude faster than modern ships, so forces can deploy in a matter of days, engagement can happen from one planet to another. Sensor disruption can reduce effective engagement distance to thousands of kilometers. Maneuverability of warships can be similar to dog fighters in the right conditions (areas of sensor jamming). Battles can occur near planetary space, with the invading forces moving too fast to intercept while in transition, and combat requires maneuverable fighters in addition to large warships (and hence carriers). Conflict zone can extend to the outer planets.
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In the distant future, star systems can wage war on each other, weapons can shatter moons and disrupt orbits of planets. FTL travel won't be restricted to outside gravity wells. Ultra-long range engagement could be made with FTL probes and FTL communication channels, eliminating any need for small nimble fighters.