Currently, there is a weekly Guild XP cap of 8,000,000 (or 4,000,000 Conquest points worth). We expect that our very large Guilds will regularly hit the cap, but the majority of Guilds will not.

Every time a Guild levels up, a few things happen:

They receive a fixed amount of Guild Commendations (these are used to purchase Guild Perks)
The amount of XP, CXP, and Reputation earned by the Guild increases. These values start at 5% XP, 5% Rep, and 0% CXP and they steadily increase until they cap at 15% XP, 15% Rep, and 10% CXP.
This is a new benefit as players can now reach higher bonuses to XP and Rep than ever before, without relying on Guild size. Plus we have introduced a new bonus to CXP which did not exist previously.
At specific Guild Level breakpoints, Guilds will qualify to purchase higher Tiers of Guild Perks.

Here is what you can expect in Nov this year of swtor credits(2018):

In Game Update 5.10 we will be introducing a brand new system to the game, Guild Leveling. Guild Levels tie heavily into both Conquests and Guild Perks, so please look out for forum posts on both of those other topics to get the full picture of what is changing! Fair warning, there is a lot of information to cover so expect a fairly long post.

Here is a TLDR for you: Guild Levels are earned via Conquest Points. As you gain levels you can slot perks into your Guild Ship to provide a variety of benefits, leveling also gives you new benefits for XP, CXP, and Reputation gain.

What is Guild Leveling and How Does it Work?
Guild leveling is fairly simple at its core. Similar to a player character, Guilds will now earn Guild Experience. As they hit the next Guild XP target, they will level up. Guilds start at level 1 and can theoretically, level infinitely.

Guild XP is earned by players in the Guild earning Conquest points. Players will earn 2 Guild XP for every 1 Conquest points earned. Ex: If a player reaches their Personal Weekly Conquest target of 15,000 Conquest points, they would earn 30,000 Guild XP for their Guild.
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