Explain the different mods

Mod's Explained
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All subject to change with update

Symbol is mod type which is used to form sets to get bonus.

Dot's are rarity 1->5 dots, MK1->Mk5. This affects how much the primary Stat will boost by. Higher rarity higher boost. 1->2 are available in mod battles 3->5 are available in mod challenges

Also the higher the rarity the more credits to remove. Currently 5 Dot/MK5 is rarest

Color is based on secondary stats it currently has. Color changes with level, addition of secondary stats, and all mods can go to level 15 and have 4 secondary stats, gold.

At levels 3, 6, 9, and 12, a secondary stat will be added or an existing secondary stat will be increased

Blue starts with 2 secondary stats
Green starts with 1 secondary stat
White starts with 0 secondary stats

The added secondary stats from what I can tell are completely random so seeing them ahead of time can be helpful.

Set bonuses can stack. (only works with 2 mod sets)
6 health mods at level 15 will give you 45% added health 3 sets of 2 health mods at 15% each. Set bonuses are independent of dots/rarity/mk level (MK1 set gives same bonus as Mk5)

For % based increase in a Stat this is added first to base than any numerical based Stat is added

Example:
Base 15000 health mod with 25% and +1000 health will give you 19750 health.
15000 x 1.25 = 18750
18750 + 1000 = 19750

You don't have to get a certain bonus set to boost that Stat.

Example Ignoring all secondary stats

Rey with 4 mod speed max bonus set, 25% increase, would go to 205 speed.

However one mk5 heath mod with primary Stat of +59 speed would take her to 223 speed.

Rey with with Mk5 health mod with primary Stat of +59 speed and 4 speed mod max bonus set would take her to 264 speed.

IMO do not buy mods from Mod shipments.

Edit: Added more info..