connecting 2 units together

> [...] how can i make the cameras connect to the linksys and still see
> them when i'm out of my home at stores or such? [...]

   Didn't we have this discussion in 2018?

      https://community.netgear.com/t5/x/x/m-p/1651330

Does the phrase "wireless access point" ring a bell?

> [...] on some of the camera forums they are saying [...]

   Thanks for the helpful links.  Are "they" also saying how to make it
all work with multiple routers?

   A simple scheme would be to configure "the linksys ea7500 router" as
a WAP.  One LAN subnet, everyone talks to everyone else, port forwarding
on the C7000 (modem_router) works as before, and so on.

> [...] i tried using one of the regular ports on the linksys [...]

   Define "regular port"?  What's an _irregular_ port?  What does
Linksys call them?

   That's one step toward configuring the EA7500 as a WAP, but I'd guess
that there's a better way.  One of us might need to consult the EA7500
documentation to see how to do it correctly.  (I vote for you.)

> [...] will i have the added security doing this? [...]

   No.

> [...] if not i can just store the linksys and in the event the c7000
> fails i have a spare. [...]

   "a spare" _what_?  A C7000 is a cable-TV modem+router.  An EA7500 is
a router.  See the difference?

> i did watch some youtubes [...]

   Sincere thanks for not including the links to those.

> [...] the way they say to connect them like bridging is not working
> and conecting then port to port did not work. [...]

   Not having wasted my time watching those movies, and having no idea
what you did, or what kind of "not working" you might have experienced,
it's tough to comment productively on that.  But how, exactly, would you
connect any of these devices to each other which would not qualify as
"port to port"?  To what do you connect anything which is not an
Ethernet port?