I think the question of connections between letters may depend upon the system. In Spencerian, the capital letters are not connected with the following letters. As for the lower case letters, they all begin with an upstroke which starts on the base line. All but 4 (b, o, v, and w) end with a stroke which drops to the base line before continuing, so there are only those 4 with possible connection problems with the following letters.
In most of those latter cases, there is a very easy connection in any case (as with b and l since the l continues with an upward stroke from the end of the b). A problem arises for, say, the connection between b and e. You either have to raise the e above the line height (which looks ugly), or drop the exit stroke of the b down a bit before heading into the e. With such simple proceedures, all of the 600+ connections are very natural and smooth (at least in Spencerian).
I may yet learn Spencerian. To me s business hand Spencerian is about as elegant as it gets. If you are truly using Spencerian, I am completely out of my league, and I bow to you. Spencerian takes an extraordinary level of control yo my knowledge and limiterd experience. And back in the day, folks studied for literally years to attain a fantastically legible, wonderfully beautiful and very fast Spencerian hand.
What I am trying to piece out is what the average person can do to get most quickly and easily--and I do not mean to imply that anything is all that easy!--to get to a reasonably fast, legible, and relatively elegant hand.
None of what I am saying is original, but I would not connect any letters into an e. Or any letters from a q or g. i do not like the look of connections into an s, but I know that it is typical and I doubt that it affects legibility There are lots of others. Some, for me, based on what is easiest to keep legible and some based on keeping letters simple and distinct. Re the latter, it seems to me that a q or a g can end below the line and stay most legible and most controlled. To connect it, one must create a loop that is an extra stroke and makes the letter less distinct. Why make that loop? It does not take any more effort and arguably takes less effort to simply pick up the pen and start the next letter afresh. An invisible connection, if necessary.