@loveisagirlnameddaisy
Thanks toppkatz Are there any tools in particular that you use?
Census records online (and previously on microfiche in the library for 1881). I mostly used to use Familysearch.org for the censuses, or anything else I could find that was free. I also used FreeBMD a lot.
The main thing I did was to start with the living (ie: me as I'm an only child and both parents deceased) and worked backwards. I used their marriage and birth certificates to find their parents, and their parents' marriages on FreeBMD. Fortunately my grandmother's maiden name was extremely unusual, and everybody of that name is related to me somehow, which helped!
Finding out ages, the names of other siblings and birthplace etc from the censuses I was able to find and send off for other birth and marriage certificates. It is also a good idea to find people's death certificates too, so if someone is on the 1891 census but not on the 1901, and their dc married in 1887 with the father not shown as deceased you can narrow it down very easily to the death being between the marriage date and the date of the next census.
Going further back, I used parish register records, again on Familysearch, but I've not used it for a few years - I've let the hobby fall by the wayside really.
Make notes of where you found the information, and if you can cross-corroborate, all the better. For instance a sibling with an unusual first name on a census might be the witness on another family member's marriage certificate, or the informant named on a death certificate.
There are a lot more online records available now, but the main thing is that you really need to double-check anything you find on anyone else's tree that they've uploaded.
Otherwise you will find yourself literally barking up the wrong tree!