Newguest 1. You can advertise online for free at least in two ways. " Newguest 2.
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Newguest1. You can advertise online for free at least in two ways.OK, but I would prefer "in at least two ways" to "at least in two ways."
Newguest2. There are at least two ways (you can use) to promote your business online for free.That's also OK, but "you can use" is redundant.
Newguest1. You can advertise online for free at least in two ways.OK, but I would prefer "in at least two ways" to "at least in two ways."
Newguest2. There are at least two ways (you can use) to promote your business online for free.That's also OK, but "you can use" is redundant.
Newguestfor freeI used to think "for free" was a bit horrible (still do to some extent), but I probably it has to be accepted informally now. I think I even find myself saying it sometimes. I wouldn't use it in formal contexts though.