As for your second question, it was in fact asked in the beginning of the thread. I'd say it's the reverence of Nature that binds all pagan religions together under the umbrella that is Paganism. I'd explain it to be observing the seasons and feeling both a spiritual and sometimes cultural bond with the land you were born onto, be it the entire planet, or a specific geographic/cultural part of it, and that often one feels a connection with all living things.
Awesome, where do I order mine???
Feel free to join in, different perspectives are always a good thing, especially when demystifying something personal like this.
I'm actually a (n eclectic) follower of the Germanic tradition myself in certain ways, as it is part of my ancestry
I don't know the details on Odinism, but have you checked it out for yourself? You might find it of use
(I work often with his female counterpart, Freyja, myself)
2) warlocks, magicians, wizards and sorcerers mostly appear in fantasy books or games, ime. The names are sometimes used in some traditions, but mostly the term 'witch' is applied. Druids are priests of the Celtic tradition (Druidism). Seers is a general term for those that hold the ability to see into the future (in the Norse Tradition known as Spå), and sometimes (if memory serves) falsely those that can contact spirits of other realms and gain information that way (mediums, shamans and volva for instance). Witch is a general term for a practitioner of the Craft (being magic). It tends to be a person who uses grounding, visualization, meditation and energy work, along with associative tools to generate a desired outcome, and considers that the main part of their craft. There's many types of witches and many different traditions within Witchcraft.
3) It's a divination tool for the most part, much like using tarot, tea leaves, crystal balls, I-Ching, etc. It is practised by those that are drawn to it, but is in no way vital to the Craft, much like tarot is just a tool as well for those that are drawn to it.
4) Rituals are meant to help the human mind go into a trance. Some people (I suspect SJs especially) find it very soothing and calming to go through the same gestures over and over, till they are in the trance they need to do the work they need to do (be it casting spells or worshipping their gods). There are those that enjoy ceremonial magic, which tends to be an almost scripted ritual for casting a spell, and those that stick with spontaneous magic, usually referred to as 'folk' magic. Personally, I fall asleep if I have to repeat the same gestures over and over again, but I do use the same associations over and over again..I just change the way I express them, or tweak it specifically for this situation, usually. Hence my preference for 'Folk' Magic. You'll find more ceremonial/ritualistic magic/ practices in the more formal covens.
5) Stones and crystals are tools. They can be of great assistance, but much like astrology, they aren't necessary. I personally am mad about crystals, especially clear quartz, as they function like a battery of power for me. But there are others who have no affinity with them and prefe perhaps herbs or colors, or even sounds to work with and establish the right frame of mind to craft the spell and raise the amount of energy you need for it.
6) Cauldrons are again, a tool. Sure you can cook awesome food in it and even perform kitchen magic with them, but they aren't a necessity either. If you like brewing potions or literally cooking up spells, it's a great thing to have though. In Wicca, the cauldron holds a special significance as a symbol of the Goddess and her fertility (uterus= like a cauldron).
7) I used to have a wand, to try out if it worked for me. It didn't. Wands are typically used to direct energy and can be used as an association tool as well (use rosequartz wand to promote harmony and peace, for instance). They tend to work as a focus for your spell, or so I'm told. The same is true for a staff, and it's also hypothesized that a staff helps ground you during the spell, due to its connection to the earth (as well as is able to draw energy from the earth for the spell if needed). The Bewitched series wasn't my cup of tea.
8) TBH, I don't hold a great deal of interest in that area. I've contemplated it, and I'd like to think we reincarnate, but I just don't know. I've never done a past life regression due to the simple fact that I'm not really open to sharing my Craft with most people and past life regressions usually require you to have someone walk you through it. Personally, I tend to not like opening my mind to the imprinting of someone else, whether they do that deliberately or not. It does't help that most people I meet who are into paganism or spirituality sit on a fucking pink cloud and float all about you till you're nauseous, and are in serious need of some fucking grounding 101 lessons, or are just escapists from reality (which I get, that place is a fucking menace). Either way, neither are welcome in my mind.
9) Astral travelling is considered a more advanced form of 'magic'. As I'm solitary on my Path it's sometimes hard to distinguish between the experiences I've had, especially as I don't reallly have much contact with fellow Pagans in general. I haven't focused on actually acquiring the skill as I'm not finding much use for it, but I do have periods where I experience intense lucid dreams which are close to the common descriptions of astral travelling. Astral travelling is the advanced form of out of body experiences, from what I recall. I've definitely had that was fear-induced. Out of body experiences are on this plane, when you can actually see your own body from outside your own body, and observe yourself. Astral Travel is where you get out of you body, and then 'travel' to another world. The world of the dead, the elves, 'heaven'..whatever you want to 'visit' as such. I tend to be able to control my dreams in the other worlds (they tend to have different rules than our reality) that I visit in my dreams and am aware of what's going on around me in the real world at the same time...literally awake while sleeping at the same time. I'm a bit fussy as of yet whether this classifies as astral travelling or not...
10) A Book of Shadow is used by a Wiccan to keep track of her spiritual journey. It typically holds all of the spells s/he crafted, the rituals s/he practises on both sabbats and esbats, general life lessons and gathered nuggets of knowledge and wisdom, a religious section, etc. A Grimoire fulfills the same purpose for a Witch, but it tends to be absent of the more rigid structure Wiccans tend to hold to as well as the typical Wiccan religious traits (though it might include chapters on her own religion as Witchcraft is a craft, and can be combined with just about any religion, in particular the pagan religions). In short, it's a spiritual diary/log.