What is there in Vedas?

Veda means Knowledge. Its an ultimate truth about the Nature - Prakruthi. It has "All Subjects" which are "All Time" and "All Place" truth. Vedas came from infinite and remain immortal even after dissolution of the whole Earth. This is because Veda is not just a text, its Naada - the Wave of bliss. We can see the collection of verses in Veda. These are the particular pattern of waves noted by various great sages during their research (Tapasya) on the Nature.

Veda is an experimented, experienced, proved and accepted publication of complete research on what ever the topic you consider. If a modern researcher says, I have invented a new thing; for him/her it is new. But Veda has explained the basic theory. So Veda is complete, truth, justice, breath of society, food, life and knowledge. Let me list some of the topics present in Vedas.

    Pancha Bhootatmaka Prakruthi - 5 Elemental Nature
        Srusti - Creation
        Sththi - Maintenance
        Laya  - Manifestation
        Prakruthi Niyama - Rules of Nature
        Prakruthi Poshana - Nourishment
        Prakruthika Lakshana - Properties of Nature
        Baugolika Siddhanta& Niyama - Geography and its rules

    Jaivika - Bio or topics related to LIFE
        Abhivrudhdhi - Development
        Prabheda - Diversity
        Charaachara - Moving and Non-Moving things.
        4 basic forms of species:
            Andaja - Egg born
            Swedhaja - Sweat born
            Yonija - Mammels
            Udbija - Earth born

        84 Lakh Jeeva Vaividhya - Bio diversity
        Analysis of bio species in terms of Geography & body nature:
            Sheetha - Cold
            Madhya - Medieval or Equal Cold & Hot
            Ushna - Hot

        Jeeva Sankula Srusti Vidhaana - The ways by which creation of life cycle of species that lead to the Biosphere
        Jeevi + Mana : Animal Species + Mind
        Sasyaadhi + Mana : Plants, metals, materials & the like + Mind
        Jeevi + Jeeva : Living being + Life
        Sasyaadhi + Jeeva : Plants, metals, materials & the like + Life
        Jeeva Rahasya : Secret of creation and sustain of Life.

    Srusti Rahasya - Secret of Creation

    Anu Parichaya - Introduction to Atom
        Anu Vijnana - Atomic Science
        Shakthi Rahasya - Secrets and formulas of Energy

    Dheha Rachana - Body Formation
        Anga Vinyasa - Design of organs or parts of the body
        AnGhika Shakthi - Power of organs
        Rachana Vinyaasa - Combined designs of different types of organs
        Kaarya Nirvahana - Unity & supportive action among diverse organs
        Deha + Mana : Body + Mind
        Mana + Maanava : Mind + Man
        Mano Vijnaana - Psychology
        Nara Vijnaana - Neurology
        Prasootika Vijnaana - Gynecology

    Rasaayana Shasthra - Chemistry

    Jeevana Dharma - Accommodation of a Perfect Life Style, Personality development, how to follow the truth and stick to principles

    Siddhanta & Darshana Shasthara - Doctrines that are proposed by enlightened sages and accepted by court of Saptarshi's are called darshana shastharas. They are 18,000 in number.
        Karma Siddhanta : Life forms & continues due to the work or duties from the past and present.
        Nireeshwara Vaadha : Samkhya denies the existence of Ishvara (God) or any other exterior influence. Universe has two realities: Purusha (consciousness) and Prakriti (phenomenal realm of matter).
        Suguna Vaadha : God or any other exterior influence has good attributes
        Nirguna Vaadha : God or any other exterior influence has no attributes
        Eshwariya Siddhanta : God is the owner of all
        EkOpaasana : Worship of only one diety
        Bahu Devataa Tatva : Different Gods
        Beeja Siddhanta : Seed Technology.
        Beeja Samskarana : Preparation of good seed.
        Shunya Siddhanta: All from void and all to void
        Adwaitha Siddhanta : Identity of the self and the whole
        Dwaitha Siddhanta : the individual souls of beings are not 'created' by God but do, nonetheless, depend on Him for their existence.
        Shakthi Siddhanta : Shiva is the static consciousness and Shakti is the dynamic consciousness. Through his Shakti, he effects the manifestation of the universe.
        Vishistadwaitha Siddhanta : It is non-dualism of the qualified whole, in which Brahman alone exists, but is characterised by multiplicity.
        Sagunoopaasana : Worship of the absolute with qualities
        Nirgunoopaasana : Worship of supreme reality without form, quality, attribute
        Moorthi Swaroopa : Corporeal form
        Niraakara Swaroopa : Non-Corporeal form
        Jnananopaasana : Worship of Knowledge
        etc., etc.,

    ROga - Disease
        ROga Parichaya - Types of Diseases
        ParihaarOpaaya - Ideas to Cure.
        Chikitsaa Vidhaana - Treatment

    Yaanam - Automobiles:
        RaTha Vidhya - Land Vehicles
        Jala Yaana - Aquatic Vehicles
        Aakasha Gamana - Sky Vehicles

    Tantra - Technology
        Tantrika Vidhya Rahasya - Secrets of technology, its effects and application
        Upaamshu - Supportive materials in each branch of Engineering
        Upasamhaara - Completion, Verification, Validation, Testing, Maintenance and Neutralizer in case of failure or adverse affects.
        Yantra Maatruka - Theory of Machines
        Darshana Vidhya - Telecommunication
        Darpana Vidhya - Display technology for output of any subject, thoughts, past and present events.

    Parikara Vijnana - Material Science

    Production & Distribution
        Krushi - Agriculture
        Vaanijya - Business
        Gruha Nirmaana - Building Construction
        Vaasthu Vidhya - Civil Engineering
        Alankaara - Interior and Exterior Design both for Building and Body

    Vidhya - Education System
        Agni Vidhya - Spiritual
        Mruthyu Vidhya - Worldly

    Samaaja Shasthra - Social Science

    Artha Shasthra - Economics

    Nyaya Meemamsa - Judiciary, law and orders.

    Vyuha Rachana - War Techniques

    Audhyogika Soothra - Employment Formulas

    Bautha Shasthra - Vedic Physics which the one and only ultimate Science

    KhagOLa Vijnaana -  Astronomy, Astrology and Cosmology

    SanKhya Shasthra - Numerology
        Saamaanya Ganitha - Common Maths
        Sthoola-Sookshma Ganitha - Micro & Macrao Maths

    Shilpa kalaadhi Vidhya - Iconography, Arts

    Gaana Naatyaadhi Vidhya - Music, Dance, Instrumental

    Wave Science: Theory, Uses, Application, Affects
        Naada Taranga - Sound Wave
        Jala Taranga - Water Wave
        Kirana Taranga - Light Wave

    Language:
        BhaaShaa Shasthra - Linguistics
        Akshara Vidhya - Formulas, reasons, and power  of Alphabets. A channel to understand any language including foreign, animals, birds, plants, materials.
        Vyakarana - Grammer
        Chandas Shasthara - Vedic Meters
        Kaavya - Poetry

    Raaja Neethi - Political Science, AadaLitha - Administration

     Adhyatma - Spirituality

    Aatma Rahasya - Secret of Soul

    YOGA

    Deva Rahasya - Secret of Gods; Deva + Maanava Sambandha - God + Man Relationship.

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This is just an overview, not complete list. All these are coded in Vedas in its own formula. So Veda has complete knowledge with high accuracy. So its the only source, reference, guide, evidence, good path shower, and rule book in this world. Hence Veda is ultimate truth and the Darshana Shastras, Siddanthas, Smruthi and others are prejudiced because they are tied to a single rule, single subject, wellness of single group of followers and propose their opinion that has limits and fail in some cases. But Veda is out of these jurisdictions and announces the real knowledge without fear for the welfare of all.