Most astrologers do NOT use the asteroids.
A few specialize in asteroids ... if you have a "specialty" you will often get invited to speak at astrological conferences. Sometimes you get paid, sometimes your expenses just get paid. If you have written a book, your lecture might prompt other astrologers to buy your book.
Astrologers have been debating over the asteroid Chiron since the 1970's, and only NOW are some starting to use it regularly.
But still, charts presented in conference lectures are just as likely to NOT include Chiron as they are TO include Chiron.
And the other asteroids? Not included at all (unless it IS a lecture about asteroids in astrology).
Juno - the way in which you are a "queen bee". Or, I suppose, a "Donald Trump".
Juno in Capricorn would mean feeling guilty about being a drama queen. OR being a drama queen TO try to get materialistic desires met.
Mars is not a woman's boyfriend. Mars is how SHE takes action and how she handles frustration.
Jupiter is not a woman's future husband. Jupiter is how SHE tries to reach out to life to expand the range of it.
The planets (and the asteroids, if you choose to include them) indicate INNER needs of the person. Not outer things.
Now .. as for the site that talks about Juno indicating the guy you are compatible with ... or being the marriage partner. IGNORE THOSE SITES.
Compatibility in astrology is never total. It is the synastry aspects between your 10 planets and another individual person's 10 planets (you have to do up THEIR natal chart) that indicate the ways in which you two are attracted to each other, enjoy each other's company, and have conflict between the two of you. There are always all of these types of synastry aspects in any synastry comparison. The planets involved, their signs, houses .. these indicate specifically WHY you two like each other and WHY you two fight.
But NO couple .. not astrologically and not in real life .. are totally compatible. No matter who you get together with, once the honeymoon/romance phase has died out, there WILL be problems, and the challenge is to learn to relax and accept or you lose the relationship.
As for your marriage partner, the chart doesn't show that. What it DOES show is the kind of partner YOU will be. How you approach romance (5th house) and how you approach being a spouse (7th house). Also your idea of what love is (Venus), and your emotional reactions including in love/marriage (Moon).
What you HOPE to see, when looking at the synastry between your natal chart and someone else's natal chart, is that one of you has your Ascendant or Descendant within 8 degrees of (a synastry conjunction) the other person's Sun or Moon or Venus or Mars.
Without this type of contact between your chart and their chart, either the relationship is not likely to become significant, or the two of you will break up within 2-3 years.
The presence of this aspect doesn't mean it WILL last. Years 3, 7, 12-15, and 20 are the most dangerous years for marriages, as the couples are passing from one stage of marriage into the next. Whether or not they CAN maneuver these periods depends not so much on astrology as it depends on the emotional maturity of both individuals.
Hope you find something useful in this.
But do forget about the asteroids. A lot of websites include them because people who don't know astrology think "Oh, this site must be better .. it has more stuff in it". But the plain fact is that the more stuff there is, the more confused beginners become, and the more LIKELY they will BUY computer-generated reports from that website.
More is NOT better.
Stick with the 10 planets, and the 5 major aspects. Until you are so good that you don't need to refer to any sources when interpreting a chart.